THE SrKl'IAL 1T.RTILIZERS OF THE FARM. 483 



application is not always followed with a great increase of quantity ; but 

 the quality of the herbage is invariably improved by the encouragement 

 they give to the clovers and finer grasses. 



Besides calcium phosphate, raw bones contain calcium carbonate and 

 azotysed carbonaceous matter (gelatine). The following analysis, by An- 

 MJII, fairly represents their composition: 



\V;iter 6-20 



Organic matter 39 13 



Calcium phosphate 48'95 



Lime 2'57 



Magnesia 0'30 



Sulphur teroxide 2'55 



Silica 0-30 



100-00 



Ammonia, which the organic matter is capa- 

 ble of yielding 4'80 



Bone-ash and animal charcoal containing from 70 to 80 per cent, of 

 phosphates, and boiled bones from the soap-works, are largely employed in 

 the manufacture of superphosphate. 



Bones which have been deprived of their organic matter by boiling or 

 burning arc more suitable than raw bones for the home process of dissolv- 

 iiii: with sulphuric acid. They dissolve rapidly and completely, while the 

 organic matter of raw bones carbonises and forms an impenetrable enve- 

 lope around -:ich fragment, preventing the further action of the acid. The 

 following plan is often pursued by agriculturists in the home process of 

 living bonea: A rinir <>t' a^hes is made on the ground of sutlieient di- 

 men Urn,- ash, <>r < rushed bones, are then placed in the encl< 



ned witli a sixth or fourth of their weight of hot wa 

 11 a thir it' <>t' their weigh t of sulphuric acid of specific gravity, 



17, is then poured over them, and tin- m 188 is moved witli rakrs until the 

 effer h is then allowed to stand for a tVw days, and if 



Lgh, peat, sawdust, or any substance free from linic ma\ 



dry it. Tl employe. 1 ly some t'ann.T-. \\lio pi 



LOdifleolyed, that they may know what they 



ig. Of 1 i| howeyer, tha diffusion of chemical knowie.i^,. 



.lleiit x.-if,.^,, ..,,-,! f rom .lee.-ption, in analy-i>. It will also be 



l>hospha- finely divided, and inf. 



in condition for drilling than that made in factories. 



