EXPERIMENT STATION. 



29 



Strong acid, usually oil of vitriol, without the addition of nitro- 

 genous matter or potash salts. They are valuable commercially 

 only for the soluble phosphoric acid which they contain. 



Six articles of this class have been analyzed. 



877. Home Made Superphosphate. Sample taken 48 hours 

 after it was prepared. 



890A. Home Made Superphosphate. The same stock as 877, 

 but taken after it had lain in a pile one week. 



890 B. The same after standing six months in a tightly closed 

 jar. 



916. Navassa Acid Phosphate. Made by the Navassa Phos- 

 phate Co., 12 and 14 Cliff' street, New York. Sampled and sent 

 by J. M. Milbank, Greenfield Hill. 



942. Acid Phosphate of Lime. Made by the Bowker Fertilizer 

 Co. From stock of Wilson & Burr, Middletown. Sampled and 

 sent by J. M. Hubbard, Middletown. 



987. High Grade Superphosphate. Made by tlie Mapes For- 

 mula & Peruvian Guano Co., N. Y. From stock of the Mapes 

 Branch, Hartford. Sampled by the Station Agent. 



1036. Packard's Concentrated Superphosphate. Imported by 

 H. J. Baker & Bro., N. Y. Sample sent by the importers at the 

 request of the Station. 



Analyses. 



Phosphoric acid soluble in water, 



lioverted* Phosphoric acid, / 



Insokible phosphoric acid, f 



Cost per ton, 



Cost of soluble phosphoric acid per ^ 

 100 lbs., S 



1036 



39.10 



6.70 



.71 



877 was made from the bone char 873 whose analysis is given 

 on the previous page, in the following way: 



100 parts by Weight of char were spread in a mortar bed and 

 wet with 42 parts of water. 55 parts of strong oil of vitriol, 

 'j 66° acid," were then added and the whole was thoroughly 

 mixed with a hoe. The solvent action of the oil of vitriol contin- 



* See page 23. 



f Making no allowance for reverted and insoluble phosphoric acid. 



I Allowing 8c. per lb. for reverted and 2|c. for insoluble phosphoric acid. 



