290

wonld probably be repaid by the increase of then'fertilizing powers; and in the state of powder theymight be used in the drill husbandry, and deliveredwith the seed, in the same manner as rape cake.

Bone dust, and bone shavings, the refuse of theturning manufacture, may be advantageously em-ployed in the same way.

The basis of bone is constituted by earthy salts,principally phosphate of lime, with some carbonateof lime and phosphate of magnesia $ the easily de-composable substances in bone are fat, gelatine,and cartilage, which seems of the same nature ascoagulated albumen.

According to the analysis of Fourcroy and Vau-quelin, ox bones are composed

Of decomposable animal matter - 51

— phosphate of lime - - 37.7

— carbonate of lime ----- 10

— phosphate of magnesia - - - 1.3

100