54 



CHEMISTRY, GEOLOGY 



Fig. 17. 



when reduced into powder ; but they are sooner 

 exhausted than when used in a larger form. 



Bones are best adapted for light or well- 

 drained lands, and may take the place of the 

 whole or part of the farm-yard manure. When 

 they are so used, it is well to combine them 

 with wood-ashes, and, thus mixed, they may be 

 drilled in with turnip or other seed. 



Crops of turnips do best when manured, alter- 

 nate seasons, with bones and the compost of the 

 farm-yard. 



Bone-dust may be profita- 

 bly applied, as a manure, to 

 grass lands that have been 

 long pastured by growing 

 stock; nor is the wetness of 

 the soil an objection to their 

 use. 



Bones consist of a peculiar 

 earth, the phosphate of lime, 

 and glue, or gelatine. If you 

 burn a thin piece of bone in 



Questions. For what lands are bones best adapted for 

 manure ? How may they be used ? How do turnips thrive 

 best ? To what other purpose may bone manure be applied ? 

 Of what are bones composed ? 



