1886.] 



PUBLIC DOCUMENT — No. 33. 



HI 



The valuation of ground bones varies somewhat, on account 

 of differences in their mechanical condition. The majority 

 of these articles are at present of a very advantageous form. 



Swift Sure Bone Meal. 



[Used at Experiment Station, 1885.] 



Moisture at 100° C, 



Total phosphoric acid, 



Soluble 



Reverted " " 



Insoluble " " 



Nitrogen, 



Insoluble ruatter, . 



Valuation per 2,000 lbs.. 



Per cent. 



5.60 

 20.36 



6.63 



13.73 



6.75 



.48 



$43.89 



Home-made Superphosphate. 



[Sent on for examinatioH from Marblehead, Mass.] 



Moisture at 100° C, . 



Total phosphoric acid, 



Soluble 



Reverted " " 



Insoluble " " 



Insoluble matter, 



Valuation per 2,000 lbs., 



Per cent. 

 26.03 



12.78 



10.87 



.59 



1.32 



16.04 



B21 04 



The article was obtained, according to a communication 

 received, by treating one thousand pounds of fine-ground 

 South^^Carolina rock phosphate with six hundred pounds of 

 sulphuric acid of 66° B. specific gravity, diluted previously 

 with an equal volume of water. As the mixture thus pro- 

 duced remains for some time more moist than desirable, it is 

 recommended to use equal weights of acid and water. 



Fertilizing Material. 



[Sentjpn for examination by Farmers' Club. Lanesborough, Mass. No guarantee 



obtained.] 



Per cent. 



Moisture at 100° C 10.59 



Total phosphoric acid, 



Soluble 



Reverted " " 



Insoluble " " 



12.06 

 6.78 

 3.34 

 1.94 



