— U8 — 
Further, Mr. Hooker had 5 tons washed, the yield of nitrate being only 
2.8 o/o while an examination of six samples collected by Mr. J. B. Fuller 
representing qualities in actual use at different places gave percentages of 
Sodium Nitrate ranging from less than i o/o to over o/o. He found the 
poorest stuff in shallow beds in the open desert 
The subject of Nitrates in Egypt was reconsidered by Mr. Frank Hughes, 
now chemist to the Ministry of Agriculture, in an article on rrThe Occurrence 
of Sodium Salts in Egypt with special reference to Nitrate of Sodar, Year- 
Book of the Khedivial Agricultural Society, Cairo, 1906, p. 1/15-170. 
Attention is directed to the abundance of salts of sodium in the Kom Ombo 
plain lacustrine deposits, and the following table shows the variable nature of 
their distribution both laterally and vertically. 
Analyses were made of the salts obtained at varying depths in three loca- 
lities, numbered 1,9, and 3 respectively. In the table the percentage of total 
salts and those of the sodium chloride, sulphate, and nitj-ate, are indicated. 
NUMBERS. 
DEPTH. 
TOTAL 
SODIUM 
SODIUM 
SODIUM 
SALTS. 
CHLORIDE. 
SCLTBATE. 
NITRATE. 
cm. 
0/0 
0 
0/0 
f 
./o 
la 
0-5 
19 
00 
3 
4G 
i4 
42 
1 
00 
16 
i5-i25 
i4 
3i 
8. 
35 
3 
o5 
0 
76 
2« 
0- 15 
8. 
90 
3. 
32 
i3 
3 
43 
26 
i5-25 
7 • 
27 
3. 
06 
0 
55 
3 
38 
2c 
1 00 
1 
77 
0 . 
7G 
0 . 
oC 
0 
83 
0-2 
0 . 
9i 
0 . 
09 
0 . 
66 
0 
17 
36 
2-12 
5 
3 a 
0 . 
aS 
4 
20 
0 
25 
3c 
12-20 
8. 
24 
1 . 
02 
6 
32 
0 
66 

20 -3o 
3. 
3o 
1 . 
45 
1 . 
26 
0 
6'i 
3 e 
3o-4o 
1 . 
35 
0 . 
0 
3o 
0 
58 
It is evident that the total salts are in greatest abundance in the upper 
26 centimetres of the soil, and crin no case was there any large amount of salt 
When not otherwise slated, all percentages refer to Sodium Nitrate. 
rrlNile Cultivation and Nitrates^, Jouni. Royal Agricullurul Society of England, vol. VII, 
p. G17-637. 
