Apr. 15, i9:!o Efject of SoluHofi Reaction on Germination and Growth 83 



Table IV. — Average reactions of cultures of series B and fjreen Heights of seedlings at 

 time of harvesting — Continued 



ALFALFA 



a Because of the uniformity of reaction of successive cultures made up to represent a given reaction 

 and the relatively small changes in reaction produced by growth of seedlings, it is assumed that the 

 average reactions found in the wheat series apply to the cultures of the soybean, corn, and alfalfa series. 

 Occasional determinations on cultures of the latter series showed this to be true. 



'' Seedlings dead at time of harvesting. 



Before discussing the foregoing data mention should be made of 

 the fact that while in practically all cases duplicate cultures agreed 

 closely, there was occasionally considerable variation between the 

 individual plants in a single culture of soybeans and corn, while in 

 alfalfa there was considerable mortality among the plants in all cultures 

 of the series. For this reason in drawing conclusions from the foregoing 

 data the authors prefer to consider the work \\-ith soybeans, com, and 

 alfalfa as somewhat preliminary in nature. This does not apply to 

 the wheat series, where no significant variations were found between 

 the plants in the cultures representing a given reaction. 



The effects of acids and alkalies upon seedings gro\\Ti in solution cul- 

 ture have been quite extensively investigated by Kahlenberg and True 

 (jj), Heald (9), Cameron and Breazeale (2), Hartwell and Pember (<?), 

 Breazeale and LeClerc (i), Dachnowski (5), Miyake {18), Gedroitz (6), 

 Loew (15), and Hoagland (u). A complete review of the reports 



