Dissolved 

 raw boue-meal 



Phos. Acid Increase of yield Plios. Acid in 



applied. of barley Increase of yield, 

 entire crop. 



Grams. Grams. Grams. 



(0.6 128.71 0.128 



] 1.2 184.02 0.257 



(l.B 200.65 0.367 



-r^. , T ( 0.6 160.29 0.196 



Dissolved ^2 180.42 0.282 



glue-free bone-meal. | , _g ^07.50 0.470 



0.6 167.29 0.200 



Superphosphate ^ 1.2 204.44 0.371 



( 0.6 

 1.2 

 (l.8 202.40 0.501 



The dissolved glue-free boue-nieal had been acted on by the sulf uric- 

 acid more uniformly. The yield, therefore, and the amount of 

 phosphoric acid taken up by the plants approach, in the latter case^ 

 nearly the results with superphosphate. 



In the second crop, oats, tlie dissolved raw bone-meal was also 

 somewhat behind the soluble phosphoric acid, while the prepared 

 glue-free bone-meal was quite equal to that standard. 



Dissolved 

 raw bone-meal. 



Dissolved 

 glue-free bone-meal. 



Superphosphate 



On the third crop, mustard, the dissolved raw bone-meal showed, 

 much better and made up in part for the previous poorer record. 



This gives further proof of what has often been shown, that in 

 order to produce an active phosphoric acid from raw mateii:ils, it i& 

 not necessary to change all the phosphoric aci<l to the soluble form. 

 These preparations contain of soluble acid, in 100 parts of total 



