128 
MR. HORNER 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 19*04 
Alumina 11*85 
Carbonate of lime 6*65 
Lime 0*56 
Magnesia 1*37 
Alkalies trace 
Chlorine trace 
Organic matter 2*57 
100*00 
II. — 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 55*64 
Sesquioxide of iron 26*89 
Sesquioxide of alumina 7*52 
Alumina 4*76 
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 
53*04 
56*86 
49*77 
54*99 
55*66 
52*76 
57*96 
55*64 
54*585 
Sesquioxide of iron 
18*43 
13*19 
22*25 
21*04 
15*94 
24*94 
19*04 
26*89 
20*215 
Sesquioxide of alumina... 
8*76 
5*49 
11*14 
4*60 
13*84 
7*52 
6*418 
Alumina 
12*11 
7*38 
5*80 
11*85 
4*76 
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 
0*75 
0*38 
0*83 
0*245 
Lime 
2*25 
3-53 
1*53 
3*08 
3*42 
0*94 
0*56 
1*912 
Magnesia 
0*66 
2*73 
0*14 
0*17 
1*03 
trace 
1*37 
0*762 
Potassa 
0*69 
0*90 
0*77 
0-69 
0*74 
trace 
trace 
0*473 
Soda 
2*16 
0*89 
0*37 
0*46 
0*55 
trace 
trace 
0*553 
Chloride of potassium ... 
0*57 
* 
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 
8*78 
4*11 
6*67 
3*74 
2*57 
5*19 
5*701 
Loss 
0*19 
100*00 
100-00 
100*00 
100*00 
100*00 
100-00 
100*00 
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 wdth a strong 
