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APPENDICES 



several samples of superphosphate. No. 1 is a mean of the 

 analysis of four superior English samples. No. 2, analysis 



of "M 's." No. 3, "D V (mean of two according 



analyses), and No. 4, mean of five average English samples. 

 Nos. 1 and 4 by Prof. Way, Nos. 2 and 3 by myself. 



No. 2 is an authentic sample furnished me by Mr. Hoyt, of 

 New Canaan, Conn. No. 3 I procured at the New Haven 

 Agricultural Store. 



No. 1 No. 2 No. 3 No. 4 



Moisture ..... 

 Organic matter and Salts of Ammonia 

 Soluble Superphosphate of Lime . 

 Insoluble Phosphate .... 



Sand 



Sulphate of Lime (gypsum) 

 Free Sulphuric Acid .... 

 Magnesia, Soda, and undetermined sub- 

 stances 



Ammonia yielded by the dry matter . 



Precipitated phosphate yielded by the 

 superphosphate .... 



Total amount of phosphate after mix- 

 ture with the soil 



.32 



.39 



100.00 100.00 100.00 100.00 



3.07 2.74 1.39 1.32 



21.80 21.95 12.28 14.72 



32.71 42.93 41.91 24.66 



Bearing in mind that the value of this manure almost 

 entirely depends on its superphosphates and its ammonia, it 



will be seen that "M 's" is in no respect inferior to the 



best English samples, while it contains in addition 10 per cent 

 of insoluble phosphate of lime, that will be permanently 

 valuable after the first effect is over. 



"D 's, " according to my analysis, (which I have per- 

 fect confidence in, all the important substances being twice 

 determined,) is six per cent behind M -'s in superphos- 

 phate, and has but about half the ammonia. The amount of 

 precipitated phosphate which will be produced when these 



