376 STATE BOARD OF AGRICULTURE. 



SERIES IV. 



Series lY. is in all res[)ects like Series I. exce])t that the bone meal 

 has been replaced by its phosphoric acid equivalent in finely ground 

 raw rock phosphate. Here the solvent action has been so slight as to 

 be practically negligible, the maximum amount of phosphoric acid 

 made soluble being 0.3% by B. subtilis as against 1.19% by germ No. 

 8 in the corresponding bone series. It may be noted further that the 

 minimum amount of soluble PoOg in the bone series, 0.51%, is consider- 

 ably larger than the maximum, 0.3%, for the phosphate rock. The 

 detailed analyses are given in Table No. 7. 



