160 



The averages of the others, which were primary granitic soils, twenty 

 in number, were : 



Ume -037 



Potash -025 



Phosphoric oxide '014 



It was not, let it be emphasised, that the latter contained less lime, 

 potash, and phosphoric oxide than the former, but that those substances 

 were largely present in the first soil in the condition already (see page 9) 

 described as grade II., whereas in the others the greater part 

 existed as plant food constituents of the third grade. With this explana- 

 tion there should be no cause for surprise that most of the nine primary 

 granite soils whose analyses follow are suown as deficient in mineral plant 

 food. 



