1892.] 



PUBLIC DOCUxMENT — No. 33. 



201 



(floats), and dissolved bone-l)l:iek. The market cost of 

 each of these articles controlled the quantity applied, for 

 each plat received the same money value, in its particular 

 kind of phosphate. 



Phosphatic slag, .... 

 ]\iona guano (West Indies), 

 Ground apatite (Canada), 

 South Carolina phosphate (floats). 

 Dissolved bone-black, . 



Cost por Ton. 



$15 00 



15 00 



6 25 



15 00 



25 00 



Analyses of Phosphates used. 



[T. Phosphatic slatr; II. Mona guano; III. Apatite; IV. South Carolina phos- 

 phate (floats) ; V. Dissolved bone-black.] 



The following fertilizers were applied to the dilferent plats 

 April 17, 1890^: — 



("127 pounds of ground phosphatic slag. 

 Plat I. (.south side), M94^3p^^^^^^^^f^j^,.^^^^fg^^^.^_ 



square leet, . . • (^ 53 pounds of potash-magnesia sulphate. 



C 128 pounds of ground Mona guano. 

 Plat II., G,5G5 square feet, . } 43^ pounds of nitrate of soda. * 



" (,59 pounds of potash-magnesia sulijlialo. 



