252 



BONES. 



The first action depends on the fermentation of the gela- 

 tine, which produces ammonia, and induces chemical motion. 

 The second action depends on the phosphate of lime, an 

 essential element in all roots and seeds. Hence bones are 

 to be regarded as stem and leaf formers, or as root, seed, or 

 grain formers. 



If both objects are to be attained, then the whole bone 

 must be used ; if only root and grain growing is intended, 

 then the phosphate of lime is to be regarded. 



302. Bones, therefore, are to be studied, 

 1st, as entire. 



2, as deprived of a portion of their geiatme. 



3, as deprived of all their animal parts. 



First, as entire bone. This comprises raw bones, butchers' 

 bones, and such as are usually thrown aside as useless, or to 

 the dogs, after the meat has been cooked and removed for 

 the family. 



The composition of entire bone may be stated as follows : 



100. 



No practical use can be made of bones till they are 

 crushed into very small bits ; these, even of half-inch size, 

 called half-inch bones, are now rarely used. Bones should 



