Page:Philosophical Transactions - Volume 145.djvu/144

128 MR. HORNE% ON THE ALLUVIAL LAND OF EGYPT. G.-Very similar to F. in external characters, but the colour inclining more to red. From the same locality as E, -but at a depth of only 5 feet 3 inches from the surface. Silica .......... ... ... .. ... ... 57*96 Sesquioxide of iron..............., .,.,,.,, .1904 Alumina .......................................... 11-85 Carbonate of lime. 665 Lime..0 .56 Magnesia...............V.. ... ... .. ... ... .. . 137 Alkalies ......................................... trace Chlorine .trace Organic matter ............ 2-57 100-00 H.-Almost identical in external characters with E. in all respects. From the same locality as D. and F, but at a depth of 9 feet 10 inches from the surface. Silica ....... 55364 Sesquioxide of iron ............................ 2G,89 Sesquioxide of alumina. 7-52 Alumina ................ 4176 Carbonate of lime ..... . . . trace Organic matter ................ ... ... . ... ,... 5'19 100-00 Composition of the eight specimens of Nile mud, taken from different localities and at different depths. A. B. C. D. E. F. G. H. Average. Silica ............ .. .. 5304 56-86 49177 54 99 55'66 52176 57.96 55164 54-585 Sesquioxide of iron I...... 18 43 13-19 22-25 21-04 15-94 24-94 19-04 26-89 20o215 Sesquioxide of alumina... 8176 ...... 5'49 11-14 4*60 13*84 ...... 7 752 6-418 Alumina . .. .. ... ... ... ... 12-11 7-38 ...... 5780 ...... 11,85 476 5 237 Carbonate of lime ......... 4#19 3-12 3*37 4 20 5.26 2*95 6-65 trace 3-717 Sulphate of lime ......... 0175 0Q38 ...... ...... ...... 083. 0245 Lime . ... ... .. ... ... .. 2 2.5 353 1*53 3-08 3 -42 0 94 0*56 ...... 1-912 Magnesia ................ 0-66 2-73 0 -14 0-17 1 03 trace 1P37 ...... 0*762 Potassa ................ 0169 0 90 0.77 0169 0-74 trace trace 0-473 Soda . . 2-16 0-89 0 37 0 -46 0-55 trace trace ...... 0 553 Chloride of potassium .............. . ... .. ... ... ... ... ............ ... ... Chloride of sodium ...... 0 04 ...... ...... ...... ...... ...... ...... ... ... ...... Chlorine ........... . ...... ... ... . trace trace trace trace ...... Sulphuric acid ............ ... ... . 0-15 0'12 0'33 ...... ...... ... ... ...... Phosphoric acid .... ... ... ...... trace trace trace ...... . ...... ... ... Organic matter......... 9 03 5.53 8178 4'11 6-67 3 -74 2-57 5 19 51701 Loss.......* . .. .. .. ..w.. ... .. . .. .. 0_1 ...... ... . ... . .. .. ...... ...... ... . 10000 10000 100*00 ]0000 100.00 10000 10000 100.00 I.-Grey sand, composed of rounded and angular transparent quartz, some opake, and minute white, brown, and black particles. I could not discover with a strong