114 AGRICULTURAL EXPERIMENT STATION. [Jan. 



The material serves for the manufacture of high grades of 

 ''formula fertilizers." The amount of sulphuric acid present 

 in either sample did not exceed 3.5 per cent. This fact shows 

 that the product is obtained by a different process than our 

 ordinary superphosphates ; it is most likely the isolated soluble 

 portion of the latter evaporated after its separation from the 

 insoluble sulphate of lime, etc. 



Flamingo Guano. 



[Sent on from Worcester, Mass.] 



Moisture at 100° C, . 

 Total phosphoric acid, 

 Soluble phosphoric acid, . 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid, 

 Potassium oxide, 

 Nitrogen, . . . . 

 Insoluble matter, 



Valuation per 2,000 lbs.. 



Per cent. 



17.20 

 16.16 

 0.48 

 5.22 

 10.46 

 0.31 

 0.80 

 2.95 



$17 86 



Dissolved Boneblack. 



[Sent on from South Deerfield, Mass.] 



Moisture at 100 C, . 

 Total phosphoric acid, 

 Soluble phosphoric acid, . 

 Revei'ted phosjshoric acid. 

 Insoluble phosphoric acid. 

 Insoluble matter, 



Per eent. 



20.43 



16.14 



16.81 



0.18 



0.15 



94 



Valuation per 2,000 lbs., . . . $25 64 



The article is a ftiir representative of its kind ; its moisture 

 is rather more than usual. 



