Page:Philosophical Transactions - Volume 145.djvu/143

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127
MR. HORNER ON THE ALLUVIAL LAND OF EGYPT.

MR. HORNER ON THE ALLUVIAL LAND OF EGYPT. 127 Silica ..................................... 'a 54 99 Sesquioxide of iron. .................. 21-04 Sesquioxide of alumina ..........V.I ...4. .. ... . 11-14 Carbonate of lime ............... ......... 4-20 Lime ........... .. ............. 308 Magnesia. 0*17 Potassa.......... - 069 Soda. 046 Sulphuric acid. 012 Phosphoric acid .......... . ... ... .. trace Chlorine .......... . . .. .. ... trace Organic matter ................................. 4l11 100-00 E.-A blackish brown earth, undistinguishable in external characters from D. Fromthe left bank of the Rosetta branch, and behind the dyke, at a depth of about 20 feet from the surface. Silica . . 55'66 Sesquioxide of iron.1594, Sesquioxide of alumina. 460 Alumina. 580 Carbonate of lime. 526 Lime . 3A42 Magnesia ...................................... 103 Potassa. 074 Soda. 055 Sulphuric acid. 033 Phosphoric acid .traces Chlorine ... . . ... ... .. ... .. traces Organic matter. 667 100 00 F.-A blackish brown earth, similar to D. and E. in external characters, but indurated: when reduced to powder, not distinguishable from them, but when moistened it kneads into a more plastic clay than they do. From the same locality as D, but at a depth of only 5 feet 3 inches. Silica ............ 52176 Sesqulioxide of iron .... ........ 24 94 Sesquioxide of alumina . ..1 3-84 Carbonate of lime .. 2.95 Sulphate of lime ... 083 Lime ... 094 Magnesia......................................... trace Alkalies .. trace Chlorine .. trace Organic matter .. 3-74 100 00