EXPERIMENT STATION. 



37 



differ so "vvidely in composition and have been so differently fer- 

 tilized and tilled as those of Connecticnt is irrational and useless. 

 Objection to these goods only applies to their names and to the 

 theory on which they are made and on which their special claims 

 rest. As fertilizers they are of good quality ; their higher retail 

 price, compared with that of other superphosphates is in part 

 justified by the larger amounts of nitrogen and potash which 

 they usually contain. 



Comparison of Special Manures. 



Bone Manures. 

 Method of Valuation. 



For the benefit of those who have not the previous reports of 

 the Station at hand, a detailed account of the method employed 

 for the valuation of bone manures is here given, being in large 

 part reproduced from former Reports. 



Experience has led us to distinguish, for the purpose of valua- 

 tion, five grades of ground bone, the proportions of which are 

 found by a mechanical analysis, ^. e., bypassing a weighed sample 

 of the bone through a system of four sieves. These five grades 

 have the dimensions, and during 1882, have had the trade- values 

 below specified, viz : 



