Transactions of the Geological Society, 1st series, vol. 4/Index

INDEX

	page
Actinolite rock, mass of in gneiss, in the Island of Oransa	186
Adularia, found at Tintagel	424
Agate pebbles, found in Sky	188
—————— found at Kinnoul, described	225
——————————————, difficulty of describing the manner of their formation	226
———————— of the Giant's Causeway, the parallel plates lie in a horizontal position	419
———————— decomposition of, in the gravel of Litchfield	428
Aikin, Arthur, Esq. Notice of some peculiarities observed in the gravel of Litchfield	426
————————, Notice on Shropshire witherite	488
————————, on a green waxy substance found near Stockport	445
Alcyonia, found in the sandstone at Whorlbury Camp	218
Allen, William, F.R.S. Barometrical Measurements, by	434
Alluvium, of Northumberland and Durham described	95
————, account of a remarkable deposit of in Sky	189
Alumine, its use when combined with lime for mortar	433
Aluminous Strata, at Campsie, Mr. Mackintosh, on the	445
Analcime, of a brick red colour, found in Sky	188
Anatase, on the primitive crystal of	250
Asbestus, found in Melmerby scar	88
Avanturine, a variety of quartz rock	272
Augite, found in grains imbedded in the basalt of Teesdale	74
Augit rock, a rock of the trap family so called	182
Baculites, found by Mr. Hony, near Maestricht	312
Barometrical Measurements, by Mr. Allen and Mr. Woods	434
Barytes, Sulphate of, Mr. Phillips on the primitive crystal of	233
————, on the cleavage of	246
Basalt occurs in the lead mine measures of Northumberland	73
———— sometimes a regular bed in them	73
Basalt in the lead mine measures of Northumberland agrees in situation with the toadstone of Derbyshire	73
───── overlying masses of, occur in many parts of the lead mine measures	74─78
Basaltic dykes. See Dykes
Basaltic veins in the granite and schist of Cruachan	123
Beadnel Bay, dyke at, described	102
Belfast Lough, nuts filled with calcareous spar found in	443
Bennet, The Hon. Henry Grey, on a whin dyke traversing limestone in the county of Northumberland	102
Bitumen, found in some varieties of the magnesian limestone near Sunderland	6
Bituminous Limestone, analysis of one, by Dr. Clarke	430
Blakheath, account of plastic clay beds near	288
Blende, note on the cleavage of	257
Bog iron ore, found in the Cheviot hills	95
Boring, estimate of the expence attending at Roxburg or Berwick	101
Breccia, occurrence of one of a modern date at Loch Ericht, having a siliceous cement	266
Brendon Hills, height of the	437
Bright, Richard M.D. on the strata in the neighbourhood of Bristol	193
Bristol, Dr. Bright and Mr. Cumberland, on the strata in the neighbourhood of	193
─────, sections of the strata near, given by Dr. Bright and Mr. Cumberland	197
─────, horizontal beds lying on the edges of the inclined strata in the neighbourhood of	202
Buckland, The Rev. W. Description of an insulated group of rocks of slate and greenstone, in Cumberland and Westmoreland, on the east side of Appleby, between Melmerby and Murton	105
──────────, Description of a series of specimens from the plastic clay near Reading, Berks: with observations on the formation to which those beds belong	277
──────────, Description of the paramoudra, a singular fossil body found in the chalk of the north of Ireland, with some general observations upon flints in chalk, tending to illustrate the history of their formation	413
Cader Idris, height of	435
Calamine, found frequently in the limestone near Bristol	200
Campsie, Mr. Mackintosh on the albuminous strata, at	445
Carlisle, plain of, consists principally of red sandstone	105
Carnerlians, account of the manner in which they are procured in Cambay	447
Chalcedony, vegetables in	398
Chalk Flints. See Flints.
Chert, lias changed into, in Sky	176
Cheviot Hills, composed of porphyry	93
─────────, its junction with the lead mine measures not visible	93
─────────, bog iron ore and hematite found in	95
Chlorite, frequent in the trap of Kinnoul	223
──────, crystals of, in quartz	398
Chlorite Schist, with felspar and quartz, rock composed of these substances interlaminated together, passing out of gneiss, at Sleat, in Sky	159
Clarke, Edward Daniel, LL.D. Analysis of one hundred parts of a dark bituminous limestone, from the parish of Whiteford, in Flintshire, North Wales	430
Clay ironstone, formerly collected by the Carron Company on Holy Island 67
─────────── found in the shale of the lead mine measures	67
─────────── sometimes forming septaria ib.
Coak, Mr. Taylor on some appearances in	448
Coal, estimate of the quantity annually raised in the Northumberland coal-field	50
─── found in most parts of the lead mine districts	67
─── quantity of, shipped at Newcastle and Sunderland	99
─── quantity shipped from Hartley and Blyth collieries	100
─── quantity imported into London	100
─── dug near Melmerby and Ousby	118
─── in Sky, appearances of	178
─── altered by contact with basaltic dykes. See Dykes.
Coal measures of Northumberland and Durham described	10
──────────── some of the lower beds of resemble the lead mine measures	11
Coal Measures, variable thickness of the beds of the	12
───────── consequent difficulty of giving a general section	13
───────── various beds composing the, particularly detailed	15
───────── dykes in the	21
───────── other irregularities in the	29
───────── sections of the	31
───────── mineral springs occurring in	51
─────── shattered strata of, accompanying the slate and greenstone rocks near Appleby	106─112
Coal works section ol, in the lead mine measures	69
Conglomerate, lying on the trap at Kinnoul	227
Conybeare, Rev. J. J. Memoranda relative to the porphyritic veins, &c. of St. Agnes in Cornwall	401
──────── Notice of fossil shells in the slate of Tintagel	424
Copper, ores of, found in Northumberland and Durham	84
Coruisk, in Sky, rocks of, described	183
Corundum, on the primitive crystal and cleavage of	254
Cotham stone, one of the beds of the lyas	196
Cross courses, in the mine of Huel Peever, their extent	142
────────── of later formation than the metallic veins	148
────────── effect of one on the killas through which it passes	154
Cross Fell, one of the highest mountains in England	58
Cruachan, Dr. Mac Culloch's remarks on the mountain so called, in Argyleshire	117
──────, difference in the porphyry rocks of, from those of Arran	134
Cumberland, George, Esq. Notes extracted from his communications on the strata in the neighbourhood of Bristol	193
─────────── On the strata at Whorlbury Camp in Somersetshire	216
─────────── Account of a trap rock at Micklewood	444
Cyanite, on the primitive crystal and cleavage of	253
Dinsdale sections at	97
Diopside, on the primitive crystal and cleavage of	252
Dorking, height of hills near	437
Dover, height of cliffs near	437
Dunkerry Beacon, height of	437
Durham and Northumberland. N. J. Winch, Esq. on the Geology of	1
Dyke of basalt in the coal-field of Northumberland and Durham, described	21
─── effect of on the coal where in contact with it 21, 24, 25, 26, 27
─── mineral resembling adularia found in that at Coley Hill	21
─── horizontal section of that at Walker colliery	22
─── at Coley hill described	21
─── at Walker colliery	22
─── at Walbottle Dean	23
─── at Tynemouth castle	24
─── at Butterby	24
─── Ninety fathom	25
─── Birtley	27
─── Thistle pit	28
─── Heworth	28
─── of basalt in the lead mine measures	76
─── at Tynemouth Priory	96
─── traversing limestone in Northumberland. Mr. Balmur's account of one	102
─── the whin composing it different from that of other deposits	104
─── through slate at Caterpallet composed of felspar mixed with talc	109
Elvan, the name given to porphyritic veins in Cornwall	401
────, a Cornish term applied to chlorite and quartz	152
Encrini, found abundantly in the black rock of Bristol	198
Epidote, forms a constituent part of the trap of Garsven in Sky	188
Exmoor, height of	437
Extracts, from the Minute book of the Geological Society	443
Fetid limestone, found in botryoidal masses in the magnesian limestone of Hartlepool	9
Fire-damp, account of	54
Flints in Chalk, Mr. Buckland's Observations on the history of	413
───────────, Theory of their formation on organic remains	420
───────────, formed in a different manner from the geodes in trap rocks	422
Flints, plated, veins of, in chalk	417
Flinty slate, appearance of in the clay slates of Cruachan when in contact with veins	118
───────── occurs on the Western shore of Sky	176
Fossil, remarkable one found at Whorlbury camp	217
Fossils, of the plastic clay formation 279, 285, 286, 292, 296-300
──────, of the Plymouth limestone, observed by Mr. Hennah	410
Fossil Fish, found in the magnesian limestone near Sunderland	9
Fossil Shells, found in the slate of Tintagel	424
───────── of Snowdon	425
Galena, found in strings in Whitley quarry near Cullercoats	5
──────, the only metallic ore found in the magnesian limestone of Northumberland and Durham	9
──────, found in nodules of clay ironstone in the shale of the coal measures	19
──────, filling a crevice by the side of a basaltic vein	24
──────, found near Bristol	200─203
Gilby, W.H. M.D. On the magnesian limestone and red marl or Sandstone of the neighbourhood of Bristol	210
Glen Gloy, traces of parallel roads in	334
Glen Roy, Dr. Mac Cmmocn on the parallel roads of	314
──────, detailed description of the parallel roads of	317
──────, their breadth	322
──────, their elevation above the sea and neighbouring lochs	327
──────, causes which produced them, were equal and similar	328
──────, connexions of with the adjoining glens	332
──────, form and structure of the parallel roads of	337
──────, its connexions with the sea	338
──────, statement and examination of the hypothesis that the parallel roads of, are works of art, as roads for hunting	343
──────, statement of the three hypotheses which attribute the formation of the parallel roads to the action of water	349
Glen Roy, examination of the first hypothesis─a deluge or large torrent	352
──────────────── second hypothesis; remains of water terraces	362
──────────────── third hypothesis—a lake occupying the valley	367
────────, difficulties attending the third hypothesis	374
────────, position of the boundaries of the supposed lake	375-384
────────, the third hypothesis the most probable	374-380
────────, the level of the sea supposed to be marked by these lines	390
Glen Turit, traces of parallel roads in, described	332
Glenwhelt, the highest land in England in the parallel from Newcastle to Carlisle	57
Gneiss, of peculiar character, occurs in the promontory of Sleat in Sky	159
──────, transition between it and graywacke and sandstone	161-165
Goniometer, common, not calculated to measure crystals with perfect accuracy	237
─────────, reflecting, measurement of crystals by the	233-241
Granitic rocks, detached masses of, compose the hill of West Down in Devonshire	147
Granite, found at Dufton Pike in Westmoreland	109
───────, junction of, with the schist at Cruachan	120
───────, the country near Cruachan appears to consist chiefly of	125
───────, its extent there	128
───────, crowns the summit of Kithill in Devonshire	147
───────, deposit of upon the schist at Cligga point	402
Granite veins, penetrate the schist of Cruachan at its junction	120
───────────, in slate in the Mourne Mountains	443
Gravel, of Litchfield, Mr. Aikin's observations on	426
Greenstone and Slate, group of rocks of, described	105
Graywacké slate, found in the Cheviot hills	94
──────── series, transition between it and gneiss in Sky	161
Grouan, a Cornish term applied to clay porphyry	152
Hangman Hill, height of	437
Heliotrope, occurs in the trap of Kinnoul	227
Helvellyn, height of	436
Hœmatite found in the Cheviot hills	95
Hennah, Rev. Richard, Observations on the limestone of Plymouth	410
Holy Island, clay ironstone formerly collected on, by the Carron Company	67
Hony, the Rev. W.E. Geological Remarks on the Vicinity of Maestricht	310
Hornblende rock, found in the Cheviot hills	95
───────── schist, alternates with gneiss at Sleat in Sky	160
Huel Peever, Mr. William's account of the veins of	139
Hastings, height of hills near	437
Hypersthene rock, rock of the trap family so called	184
Infiltration, process of, by which veins are formed	395
Ingleborough, height of	435
Iron, ores of; found in Northumberland and Durham	85
Iron pyrites, found abundantly in coal and shale; sold to the manufacturers of green vitriol	19
Iron sand, magnetic, found by Dr. Traill in Cheshire	447
Iron, specular, on the primitive crystal and cleavage of	251
Iron work, one only now remaining in Northumberland	67
Iserine, found by Dr. Traill in Cheshire	447
Jasper, its resemblance in character to porphyry	134
Junction of granite and schist at Cruachan	120
────── of trap and schist at Kinnoul	228
Killas, traversed by beds of other rocks in Devonshire	151
────, Dr. Mac Culloch on certain colours in	398
────, the principal rock from the borders of Dartmoor along the Tavy	146
────, extends to the coast, and joins the Plymouth limestone	148
────, of Devonshire intersected by metallic veins	148
────, altered in its texture by a cross course	154
Kinnoul, Dr. Mac Cullochs's Observations on the Hill of	220
──────, composed chiefly of trap	221
──────, trap conglomerate at	227
──────, junction of trap and schist at	228
────── agates, difficulty of explaining their formation	226
Lakes of Scotland, accumulations of alluvium are gradually filling them	381
Laumonite, found near Loch Eynort in Sky	187
────────, alteration in its degree of hardness	188
Lead, quantity of, annually shipped at Newcastle and Stockton	82
────, carbonate of, on the primitive crystal and cleavage of	257
────, sulphate of, on the primitive crystal and cleavage of	259
──── mine measures, of Northumberland and Durham described	57
────────────────, uniformity of in the southern part of Northumberland	58
────────────────, total thickness of estimated	58
────────────────, sections of the	59
────────────────, coal found in most parts of	67
────────────────, sections of the collieries in	69
────────────────, organic remains in the	71
────────────────, metallic veins in	77
────────────────, minerals of described	83
Lemmington, iron work at, the only one now in Northumberland	67
Lewisham, account of the plastic clay beds near	285
Lias, of Sky converted into chert	176
─── occurs at Redland near Bristol	196
Limestone near Ord in Sky, contains flint or chert in nodules	171
──────── and Coal measures, shattered beds of accompanying the slate and greenstone rocks near Appleby	106-112
───────── beds of the lead mine measures described	65
─────────── more regular thickness in than the shale or sandstone	66
────────, bituminous. See Bituminous Limestone
────────, entrochal, insulated mass of at Keisley	114
────────, in balls, singular stratum of, near Bristol	201
──────── series of Sky described	166
Linton, height of	437
Litchfield, Mr. Aikin's observations on the gravel of	426
Lodes. See Veins.
London, account of the plastic clay beds near	283
─────, on the formation of the marsh lands near	302
───── clay, occurring at Shooter's Hill	290
Lyas. Sec Lias.
Lydian stone, appearance of in the clay slate of Cruachan when in contact with veins	118
Mac Culloch, M.D. F.L.S. President of the Geological Society, Observations on the Mountain Cruachan in Argyleshire, with some remarks on the surrounding country	117
──────────── Corrections and additions to the Sketch of the Mineralogy of Sky, published in the Third Volume of the Transactions of the Geological Society	156
─────────── Observations on the Hill of Kinnoul in Perthshire	220
──────────── Supplementary observations on quartz rock, made in 1814	264
──────────── Further observations, 1816.	273
──────────── On the parallel roads of Glen Roy	314
──────────── On a shifted vein occurring in limestone	392
──────────── Explanation of a Supplementary plate to the paper on vegetable remains preserved in chalcedony, printed in the Second Volume of the Transactions of the Geological Society	398
──────────── On a peculiar disposition of the colouring matters in a schistose rock	399
Mac Donnel, Dr. notice of nuts filled with calcareous spar in Belfast Lough	443
────────── on veins of granite in slate in the Mourne Mountains	443|}
Mackintosh, C. Esq. on the albuminous strata at Campsie	445
Maestricht, Mr. Hony's remarks on the Geology of the vicinity of	310
Magnesian Breccia, note on, by Hsmw Wnnvnrou, Esq.	205
─────────────, its connection with the red marl, and occurrence near Bristol, and on the Mendip hills	207
─────────────, conjecture as to the former extent of the bed of, near Bristol	207
─────── limestone, of Northumberland and Durham described	3
─────────────, remarkable deposit ol, on the coal measures at Cullercoats in Northumberland	4
─────────────, flexible variety found near Sunderland	6
─────────────, near Sunderland sometimes contains bitumen	6
─────────────, of Northumberland and Durham rests on the coal measures	8
─────────────, no coal mine yet won by sinking through it	ibid.
─────────────, and red marl or sandstone of the neighbourhood of Bristol, Dr. Gilby on	210
─────────────, near Bristol, analysis of	212-215
─────────────, bed of, conformable to the mountain limestone, near Ross and near Bristol	215
Magnet affected by the summit of Cruachan	124
Manganese, found in small quantities in Sky	189
─────────, found near Bristol	201
Marble, of good quality found in the Isle of Tino	446
Marle-shell. See Shell-marle.
Marsh Lands, near London, notices on the formation of	302
Melmerhy, description of a group of rocks of slate and greenstone near to	105
Mendip hills, height of the	436
Micaceous schist of Sleat in Sky, does not compose the whole promontory, as stated in the preceding volume	159
Micklewood, Mr. Cumberland's account of a trap rock at	444
Minehead, height of North hill near	437
Mines of Devonshire, near Morwel Down, enumerated	149
Mineral Springs occurring in the coal field described	51
───────────── in the lead mine measures	88
Morwel Down, in Devonshire, description of the tunnel through	146
Mountain limestone, forms an elliptical basin in the neighbourhood of Bristol	210
────────────, coal measures resting on it	211
Needlestone, found in Sky	189
Northumberland, Mr. Bennet's account of a whin dyke in	102
Northumberland and Durham, N. J. Winch, Esq, on the Geology of	1
Nuts, filled with calcareous spar, found in Belfast Lough	443
Okehampton, height of	437
Old red sandstone. See Red Sandstone, Old.
Olivine, found in grains imbedded in the basalt of Teesdale	74
─────── found in Sky	189
Oolite, stratum of found in the magnesian limestone beds at Hartlepool	7
Organic remains found in the magnesian limestone	10
───────────── found in the coal measures	19
───────────── none marine, among those of the coal measures	20
───────────── in the lead mine measures	71
───────────── in the limestone of Sky 169, 175,	176
Paralel Roads of Glen Roy, Dr. Mac Culloch on the 314
Paramoudra, description by Mr. Buckland of the fossil so called	413
────────── its mineral History connected with that of many spungiform bodies found in chalk	416
Pentowan. Mr. Smith on the stream works of	404
Pen-y gant, height of	435
Petroleum, found in the black rock of Bristol	199
Phillips, William, Esq. Account of some attempts to ascertain the angles of the Primitive Crystals of Quartz and the Sulphate of Barytes	233
───────────── On the measurements, by the reflecting Goniometer of certain primitive crystals; with observations on the methods of obtaining them by mechanical division along the natural joints of crystals	241
Plastic clay, Mr. Buckland on the beds of	277
────────, account of the beds of near Reading	282
────────, ────────────── near London	284
────────, ────────────── on the coast of Sussex	294
──────────────── their connexion with those of France	298
Plumsted, account of the Plastic Clay beds near	290
Plymouth, Mr. Hannah's observations on the limestone of	410
Porphyritic veins, of St. Agnes. Rev. J. J. Conybeare on	401
─────────────── probably contemporaneous with the schistose rocks which they traverse	402
─────────────── appearance of the schist in contact with them	403
Porphyry of the Cheviot hills described	93
─────── veins of, traversing the schist and granite of Cruachan	121
──────────────── generally appear perpendicular	121
──────── of Cruachan, its varieties described	122
─────────────── shews a regular series of transition from porphyry to trap	123
Potter's clay, found immediately below the soil over the coal measures	16
Quartz, beds of, interstratified with the marble limestone of Sky	167
────── Mr Phillips on the primitive crystal of	233
────────────── on the cleavage of	247
Quartz rock and schist series of Sky, described	161
──────────────── alternates repeatedly with red sandstone	162
────────, Dr. Mac Culloch's supplementary observations on	264
────────, circumstances to prove that its origin is partly mechanical	268
────────, avanturine a variety of	272
────────, particulars of its occurrence in Sky	273
────────, alternations of, with red sandstone and greywacke schist	274
Quicksands, covering the coal measures	30
Reading, account of the plastic clay beds, near	278
Red marl or sandstone of the south-eastern part of Durham described	2
──────────────── analogous to the red sandstone of Nottinghamshire	3
Red marl, probable identity of the deposites of, that cover the coal measures and abut against the inclined edges of mountain limestone	208
Red sandstone with gypsum composes the greater part of the plain of Carlisle	105
────────── more recent than the old red sandstone	106-115
──────────────────, its contact with the other rocks near Melmerby, described	112
────────── near Melmerby the same as that of Cheshire and Salop	116
Red sandstone, Old, found in the Cheviot hills	94
─────────────── interposed between the limestone series of Cross Fell, and the slate	111
─────────────── the lowest rock of the neighbourhood of Bristol	210
─────────────── bed of, in the slate near Cruachan	119-135
─────────────── transition between it and gneiss in Sky	161-165
Resin and oil, substance composed of, found near Stockport	445
Roads, Parallel. See Parallel Roads.
Saddleback height of	436
Salt spring, issuing from the interstices of a basaltic vein at Butterby	24
Sandstone, varieties of in the coal measures, described	17
────────, beds of in the lead mine measures described	63
────────, of Strathaird in Sky, observations on	171
Satin spar, found in a black slate clay at Aldstone	67
Schist of Cruachan, its junction with the granite	120
──────────── much indurated where in contact with the granite	121
Secondary strata, of Scotland, their line of separation from the primary generally noticed	221
Section of the coal measures	31
────── of the lead mine measures	59
────── of collieries in the lead mine measures	69
────── at Dinsdale	97
────── of Catsgrove Hill, near Reading	278, 281
────── of the Woolwich sand pits	284
────── of Loam Pit Hill, near Lewisham	285
────── at the canal at New Cross	292
────── of the Castle Hill at Newhaven	296
────── of the cliff near Dieppe	298
────── of the Pentowan Stream works	405, 406
Shakespeare's Cliffs height of	437
Shale, numerous beds of, among the lead mine measures 66
Shap Fells, height of	432
Shell Marle, Mr. Warburton, on some beds of, in Scotland	305
Shifted Vein, Dr. Mac Culloch on a	392
Silica, infiltration of	266, 269
Siliceous schist, on the western shore of Sky derived from shale	176
Skiddaw, height of	436
Sky, Dr. Mac Culloch's additions to the Sketch of the Mineralogy of, published in the Third Volume of the Transactions of the Geological Society	156
─── alternations of gneiss and mica slate in, 159—with chlorite, schist, ib.—and hornblende schist, 160—transition of the gneiss series into graywacke, 161—165—Quartz rock series in, 161—Limestone series, 167—Trap, 173—Siliceous schist and chert, 17 6—Augit rock, 182—Hypersthene rock, 184—Minerals of, 186, seq.
─── remarkable alluvial deposit in	189
Slate, converted into siliceous schist in Sky	176
─── shells found in, at Tintagel	424
────────────── on Snowdon	425
─── granite veins tin, in he Mourne mountains	443
Slate and Greenstone, group of rocks of, described	105
Slate Clay, found throughout the Coal field	17
Sleat, Promontory of, in Sky, described	159
Sleat, in Sky, mass of trap at	182
Smith, Edward, Esq, on the Stream works of Pentowan	404
Snowdon, shells found in the slate of,	425
─────── height of	434
Springs, in the neighbourhood of Bristol, their situation 204
St. Agnes, Rev J. J. Conybeare, on the porphyritic veins of	401
Strath, in Sky, remarkable trap veins at	185
Strontian, found near Knaresborough	445
────── Sulphate of, found in balls in the sandstone near Bristol 196, 202, 214
────────────── on the primitive crystal and cleavage of,	255
Staurotide, on the primitive crystal of	250
Syenite, of Sky, described	169
Taylor, John, Esq. Description of the Tunnel of the Tavistock Canal, through Morwel Down in the county of Devon	146
──────────── notice on some appearances in coak	448
Tin, Oxide of, Mr. Phillips on the cleavage of	245
Tino, Isle of, notice on the rocks of the	446
Tintagel, shells found in the slate of	424
Traill, T. S. M.D. notice of iserine and magnetic iron-sand in Cheshire	447
Trap, in the vicinity of Cruachan	137
────, of Sky described	178
────, variety of, called augit rock by Dr. Mac Culloch described	182
────, variety of, called hypersthene rock by Dr. Mac Culloch described	184
────, account of remarkable veins ol§ at Strath in Sky	185
────, Kinnoul Hill composed chiefly of	221
─────────────, its varieties there, described	222
────, occurs at Micklewood in Gloucestershire	444
──── of Kinnoul, both porphyritic and amygdaloidal	223
─────────────, its junction with schist	228
──── of Sky, additions to the account of	180
──── of Irottemish, has the appearance of inter stratification and alternation with the strata it covers	180
Trap, of Trotternish, the alternation only apparent, and this is probably the case in all other instances of such supposed alternation	181
──────────────, columnar on a large scale	181
──────────────, generally composed of augit and felspar	182
Trees, found in the marsh lands near London	302
Tunnel of the Tavistock canal, description of the	146
─────────────────────, accuracy in the direction of the drift, its length and ventilation while making	155
Tweed, account of the beds on the banks of the	90
Trotternish in Sky, its rocks described	178
Veins, numerous and chiefly of porphyry traverse the slate of Cruachan	118-121
──── of trap sometimes occur in the slatc of Cruachan	118-123
──── of Huel Peever described by Mr. Williams	139
──── of copper and tin run from north-east to south-west	148
──── that do not run north-east and south-west, generally unproductive of metal and seem of newer formation	148
──── occur but in few sorts of rocks	151
──── run through all the strata	151
──── at Morwel Down, their dip	151
────, general notice of such as are productive near Morwel Down	152
────, filled by infiltration	395
────, porphyritic. See Porphyritic veins
Vegetable remains in chalcedony, Dr. Mac Culloch on	398
Ventilation of the drift for the Tunnel of the Tavistock canal, reference to account of	155
Warburton, Henry, Esq. Note on Magnesian breccia	205
──────────── On some beds of Shell-marle in Scotland	305
Whernside, height of	435
William, John, Junr. Esq. Account of some remarkable disturbances in the veins of Huel Peever in Cornwall	139
Winch, N.J. Esq. Observations on the Geology of Northumberland and Durham	1
Witherite, Mr. Aikin on, found in Shropshire	438
————, analysis of	442
Whorlbury Camp in Somersetshire, George Cumberland, Esq. on the strata at	216
Woods, Samuel, Esq. Barometrical measurements by	436
Woolwich, account of the plastic clay beds near	284
Yester, height of	437
Zinc, ores of, found in Northumberland and Durham	85
Zircone, on the primitive crystal and cleavage of	248

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