8o Journal 0} Agricultural Research vo\. in. No. 1 



does not approach the magnesia-sihca reaction in rapidity, it is shown 

 by field data that the hme-siHca reaction continues long after the attain- 

 ing of alkalinity and that the reaction is extensive. 



Toxicity due to excessive treatments of magnesium carbonate after 

 its conversion to silicates was demonstrated by plant growth. 



The progress of the work of the writer and associates is reported in 

 detail in Tennessee Experiment Station Bulletin 107. 



