263 
M. Merat Guillot has given the following esti- 
mate of the composition of the bones of different 
animals. 
Phosphate 
of lime. 
Carbonate 
of lime. 
Bone of Calf 
54 
Horse 
67.5 
1.25 
— — — Sheep 
70 
5 
Elk 
90 
1 
Hog 
52 
1 
— — Hare 
85 
1 
— Pullet 
72 
1.5 
• Pike 
64 
1 
Carp 
Horses’ teeth 
45 
5 
85.5 
25 
Ivory 
64 
1 
The remaining parts of the 100 must be con- 
sidered as decomposable animal matter. 
Horn is a still more powerful manure than bone, 
as it contains a larger quantity of decomposable 
animal matter. From 500 grains of ox horn Mr. 
Hatchett obtained only 1.5 grains of earthy resi- 
duum, and not quite half of this was phosphate of 
lime. The shavings or turnings of horn form an 
excellent manure, though they are not sufficiently 
abundant to be in common use. The animal mat- 
ter in them seems to be of the nature of coagulated 
albumen, and it is slowly rendered soluble by the 
action of water. The earthy matter in horn, and 
still more that in bones, prevents the too rapid 
decomposition of the animal matter, and renders 
it very durable in its effects. 
Hair woollen rags , and feathers , are all analogous 
in composition, and principally consist of a sub* 
s 4 
