378 J. J. SKINNER 



Manganese increases the oxidizing power of plants in certain 

 soil extracts^ as will be as increases the oxidation of certain soils. ^ 



In another paper will be given experiments bearing on the effect 

 of manganese in soils to which vanillin and salicylic aldehyde 

 were added. It is there shown that manganese destroyed their 

 effects to a certain extent. All these results point to the fact 

 that manganese through stimulating oxidation can aid in the 

 destruction of such harmful organic substances as aldehydes 

 capable of ready oxidation. 



* Schreiner, O., Sullivan, M. X., and Reed, H. S., Studies in soil oxidation. 

 U. S. Dept. Agr., Bur. Soils Bui. 73. 1910. 



