ELISHA MITCHELL SCIENTIFIC SOCIETY. 



115 



TABLE II. 



SHOWING ACTION OF SOILS ON SUPERPHOSPHATES- WAGNERS RESULTS 



In order better to compare the above results, I have calculated 

 the following (Table III): 



TABLE III. 



SHOWING FINAL ACTION IN TABLE II. 



The observations that can be drawn from these experiment- 

 give nearly the same results noticed in the experiments of 

 Voelcker, viz. : 



1st. That presence of lime in the soil causes rapid precipita- 

 tion of the soluble phosphoric acid of the superphosphates. 



2d. The larger the content of lime the greater is the action. 



3d. That the duration of action increases the amount precipi- 

 tated, and 



4th. The increase of the amount of the soil, where the super- 

 phosphate remains the same, naturally increases the precipitation, 

 just as the increase of the content of lime in the soil would so 

 increase it; for in each case the superphosphate is brought in 

 contact with a larger amount of lime. 



♦The results here recorded contain a mistake which was noticed in the original cal- 

 culations; so in the comparison mixture 1 mn.-t be omitted. 



