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CONTENTS.
| VIII. | Remarks on the Vitrified Forts of Scotland. By J. Mac Culloch, M.D. F.L.S. Chemist to the Ordnance, and Lecturer on Chemistry at the Royal Military Academy at Woolwich, and Vice-President of the Geological Society. | p. 255 |
| IX. | On the Sublimation of Silica. By J. Mac Culloch, M.D. F.L.S. Chemist to the Ordnance, and Lecturer on Chemistry at the Royal Military Academy at Woolwich, and Vice-President of the Geological Society. | p. 275 |
| X. | Observations on the Specimens of Hippurites from Sicily, presented to the Geological Society by the Hon. Henry Grey Bennet. By James Parkinson, Esq. Member of the Geological Society. | p. 277 |
| XI. | An Account of the Coalfield at Bradford, near Manchester. By Robert Bakewell, Esq. communicated to the Society by Dr. Roget, Member of the Geological Society. | p. 282 |
| XII. | Some account of the Island of Teneriffe. By the Hon. Henry Grey Bennet, M.P. F.R.S. and President of the Geological Society. | p. 286 |
| XIII. | On the Junction of Trap and Sandstone, at Stirling Castle. By J. Mac Culloch, M.D. F.L.S. Chemist to the Ordnance, and Lecturer on Chemistry at the Royal Military Academy at Woolwich, and Vice-President of the Geological Society. | p. 305 |
| XIV. | On the Economy of the Mines of Cornwall and Devon. By John Taylor, Esq. Member of the Geological Society. | p. 309 |
| XV. | On the Origin of a remarkable class of Organic Impressions occurring in Nodules of Flint. By the Rev. William Conybeare, of Christ Church, Oxford, and Member of the Geological Society. | p. 328 |
| XVI. | A Description of the Oxyd of Tine, the production of Cornwall; of the Primitive Crystal and its modifications, including an attempt to ascertain with precision, the admeasurement of the angles, by means of the reflecting Goniometer of Dr. Wollaston: to which is added, a series of its crystalline forms and varieties. By William Phillips, Esq. Member of the Geological Society. | p. 336 |
