ANALYSES. 209 



phoric acid present in a ton, the amount of sul- 

 phuric acid used must be very small. 



Mr. Whann says, that guano is used, but he 

 does not state the kind or kinds, or the propor- 

 tions. We hazard the assertion that there is a 

 large amount of Charleston, with a very small 

 amount of Peruvian. 



He also notifies us that potash and soda are 

 used. The reader will notice by the analyses, 

 that a ton of his superphosphate contains 4 Ibs. 

 of potash, worth 32 cents. The benefits result- 

 ing from such an amount cannot be very marked, 

 as it requires 40 Ibs. of potash for 25 bushels of 

 wheat with the straw. No adulteration is said 

 to be practised in preparing this superphosphate, 

 but Mr. Whann admits to using soda. We pre- 

 sume he means salt cake or sulphate of soda, 

 usually sold for $10 per ton, or he may apply 

 salt or chloride of sodium. In either case, when 

 Mr. Whann can prove the necessity of the use 

 of soda in any form in a superphosphate, or that 

 a large amount of crude mineral phosphate, which 

 when ground could not possibly cost him over 

 $17 per ton, should be found in a high-priced 

 fertilizer represented to be made from '" Raw 

 Bone," and sells for $52 per ton, we will admit 

 that there has been no adulteration practised ; 

 and when he can satisfactorily account for the 

 presence of 267*60 Ibs. of insoluble phosphoric 



