46 



Journal of the Mitchell Society 



[August 



corn plant which discoloration is apparently due to accumulation of 

 iron within the plant. If we are able to establish this relationship, 

 then we shall be able to discuss intelligently the physiological effect 

 of the fertilizers used. 



The following table was made by Dr. G. N. Hoffer, working at 

 Purdue University, to show the relative discoloration of nodal tissue 

 in plants sent him by Mr. Howell. (The figures at the right and 

 bottom are mine). 



Table III. Relative Amounts of Iron in the Nodal Tissues of Corn Stalks 

 FROM the Nissen Faems, Terra Ceia, N. C, August 1, 1922 



Nodal tissue condition : 

 — normal. 

 4- — slight purple color. 

 -|-+ — purple brown. 

 -^ -(--)- — Dark purple brown and disintegration of nodal tissue. 



Note the marked effect of the kainit and of the nitrate of soda in 

 the reduction of discoloration ; also the effect of the acid phosphate 

 in the increasing of the discoloration. The figures at the right and 

 the bottom are the total number of checks in the respective columns 



