282 Univt rsity of California Publications in Agricultural Sciences [Vol. 3 



have been so increased for a time in the blow sand, but not in the 

 clay adobe soil. 



6. The soluble sulphur content was increased in the solution of the 

 greenhouse soil by CaC0 3 applications and probably also in that of 

 the blow sand, due to similar treatment. 



7. The phosphorus content of the solutions of the three soils studied 

 seems to have remained unaffected by the treatments accorded the 

 soils. The indications are, however, that a slight depression in the 

 amount of the water soluble phosphorus may have resulted from the 

 CaCO, or the CaS0 4 applications in one case. In this case also no 

 generalization is attempted. 



8. It seems that our current teachings on soils and plant physiology 

 should be corrected with these results as a basis. 



Transmitted June 4, 1918. 



