2.62
Equal to ammonia 3.18

COMPOSITION OF COMPOUND BONES.

The following analysis illustrates the composition of compound bones:--

Moisture 8.10
*Organic matter and water of combination 37.22
Monobasic phosphate of lime 13.68
(Equal to tricalcic phosphate rendered "soluble" 21.42)
Insoluble phosphate of lime 10.48
Calcium sulphate, magnesia, alkalies, &c. 26.02
Sand 4.50
------
100.00
------
*Containing:--
Nitrogen 1.90
Equal to ammonia 2.30

NOTE III. (p. 369).

As showing the composition of bone-ash, the following analysis may be
quoted:--

Moisture .25
Organic matter .85
*Phosphoric acid 35.56
Lime 47.09
Magnesia, alkalies, &c. 9.80
Sand 6.45
------
100.00
------
*Equal to tricalcic phosphate 77.63

NOTE IV. (p. 370).

Composition of bone-char (on dry sample):--

Carbon 10.51
Calcium and magnesium phosphates, calcium fluoride, &c. 80.21
Calcium carbonate 8.30
Calcium sulphate .17
Ferric oxide .12
Silica .34
Alkaline salts .35
------
100.00
------

CHAPTER XII.

MINERAL PHOSPHATES.

In this chapter we shall give an account of the more commonly occurring
mineral phosphates. In Chapter V., where we discussed the position of
phosphoric acid in agriculture, it was pointed out that mineral
phospha