52 



EXPERIMENT STATION. 



[Jan. 



the manufacturer cannot sell mixed fertilizers at these figures. 

 He must obtain an advance sufficient to cover costs of manufac- 

 ture, bagging, agencies, credits, etc. The above differences 

 do not represent his profits. These are much smaller, and 

 are probably not excessive in the case of reliable firms. It is 

 probable, however, that the cash buyer of high-grade unmixed 

 goods can secure needed plant food in that form at a cost con- 

 siderably lower than in licensed complete fertilizers, and that 

 by intelligent selection he can procure materials from which 

 can be made home mixtures at least equally effective with such 

 fertilizers. 



(e) Summary of Analyses and Chiarantees. 



