BULLETIN No. 91d. 
9 
TABLE II. The Effect of Washing the Magnesium-Ammonium-Phosphate 
Precipitate upon the Per Cent, of P 3 0 5 
Material. 
Number of washings. 
U5 
O 
a 
CL 
73 
O 
H 
Total P 3 0 5 , duplicate 
Average. 
Difference between 
the least and highest 
number of washings. 
Name of Chemist. 
1 I 
Pr ct. 
Pr ct. 
Pr ct. 
Pr ct. 
No. 1. 
Acid phosphate.. 
8 
14.64 
14.84 
14.74 
Noble. 
No. 1. 
Acid phosphate. . 
21 
14.16 
14.01 
14.08 
.66 
Noble. 
No. 1. 
Acid phosphate.. 
Free o 
f chlor 
ids. 
14.13 
Meng. 
No. 2. 
Mixed fertilizer__ 
8 
11.44 
Noble. 
No. 2. 
Mixed fertilizer... 
21 
10.44 
10.48 
10.46 
.98 
Noble. 
No. 2. 
Mixed fertilizer___ 
Free o 
f chlor 
ids. 
10.45 
Meng. 
No. 3. 
Mixed fertilizer.. 
10 
10.14 
/ 
Meng. 
No. 3 
Mixed fertilizer__ 
25 
9.85 
.29 
Meng. 
No. 4. 
Mixed fertilizer.. 
10 
10.40 
Meng. 
No. 4. 
Mixed fertilizer.. 
25 
10.00 
.40 
Meng. 
III. ON THE TOTAL AND WATER-SOLUBLE POTASH IN COTTON-SEED MEAL. 
By B. W. KILGORE and R. E. NOBLE, Assistant Chemists. 
Daring the past fertilizer season three samples of cotton-seed meal, 
collected by the inspectors (the same samples as used in the phosphoric 
acid investigations reported in a preceding article), were analyzed 
by the incineration method with sulfuric acid for total potash, and 
by boiling in water for the water-soluble, with the following results : 
Laboratory 
Number. 
Material. 
potash, k 3 o 
1 u <i> 
73 -23 
437 
Cotton-seed meal ...... 
1.53 
1.20 
438 
Cotton-seed meal _ ___ 
1.74 
1.46 
439 
Cotton-seed meal____ ____ 
1.93 
1.77 
* 
Average.... 
1.73 
1.48 
_ 
Conclusion. —85.5 per cent, of the total potash in these samples 
of cotton-seed meal was soluble in water. 
