VARIOUS PHOSl'HATIC MANURES ON Ul'LANO SOIL. 
2. Precipitated Calcium Phosphate containing 29.35 % total 
phosphoric acid and 24.80 % soluble in neutral ammonium citrate. 
3. Thomas Phosphate containing 21.75 % total phosphoric 
acid ; 75 % of the fertilizer passed through the standard sieve. 
4. Steamed Bone Dust containing 21.75 % phosphoric acid, 
3.87 % nitrogen, and 1.33 °o fat. The separation with chloro¬ 
form showed that in 100 parts of the manure 0.94 % of the 
nitrogen was not in the form of bony substance; hence the pro¬ 
portion of nitrogen to phosphoric acid in the bony part was 1: 7.9, 
showing that a considerable part of the gelatogenous substance had 
been extracted. 
5. Crude Bone Dust containing 19.70 ° 1 > phosphoric acid, 
4.74 % nitrogen and 1.93 % fat. From 100 parts of the manure 
0.71 % of the nitrogen could be separated by chloroform as not 
belonging to the bony part; hence the proportion of nitrogen to 
phosphoric acid in the bony part was 1 : 4.9 which allows us to 
conclude that no gelatogenous substance had been extracted from 
the bones. The low content of fat indicates that the bones had 
been extracted with benzene or a similar reagent. 
6. Raw Crushed Bones prepared by ourselves from tubular 
horse bones from which the meat and tendons had been carefully 
removed. The coarsely granular mass contained 21.66 ° 1 > phos¬ 
phoric acid, 4.61 nitrogen, and 14.07 % fat. With the help of 
chloroform it was found that in the bony substance of 100 parts of 
the whole manure there were 3.93 % nitrogen, the other 0.68 °o of 
nitrogen existed in the form of meat and tendons. 
7. Bone Ash containing 30.465 % total phosphoric acid; 
4.89 % phosphoric acid were dissolved by neutral citrate solution. 
The granulation of the manures No. 4-7 as determined with a 
set of sieves with round holes, was as follows : 
Diameter of the particles, 
Steamed 
Crude 
Raw crushed 
Bone 
millimetres. 
bone dust. 
% 
bone dust. 
0 / 
/o 
bones. 
0 / 
/o 
«pill. 
0 / 
/O 
Less than 0.25 
... 
... S4.9 
37 -i 
l6.6 
9 3 -° 
0-25--0.5 . 
... 
... II.I 
25-2 
28.1 
6.9 
°-5 “I .. 
... 
... 4.0 
35-3 
54-3 
0.1 
I —2. 
... 
... — 
1.1 
I-.Ô 
— 
