-2- 



same lot and all v/ere to follov/ the s?me general methods, 

 so that their results mi^t be relatively comparable. 



The aim of the cooperation was to find out what 

 salts, salt proportions, and total concentrations of the 

 media, night gener^aOy produce the best grov/th of the 

 standard plant for each of the developmental phases 

 employed, and what ones might give good grov/th for 

 certain kinds of aerial environments... The "Marquis" 

 variety of spring wheat was selected as the test plant. 

 Pour phases of development v/ere outlined for studyl 



rfU 



"(1) Germination phase, from beginning of soaking 

 till the shoot is four centimeters high, measured from ■"/(. 

 seed to the tip of the shoot. (2) Seedling phase::, from 

 the end of phase 1 for a period of five weeks, without 

 regard to tbe size of the plant. (3) Vegetative phase, 

 from the end of phase 2, until the first appearance 

 of flowering in the controls. (4) Reproductive phase, 

 from the end of phase 3 until maturity is reached by the 

 Best five cultures. 



The Solutions to be tested were planned on the 

 basis of the scheme suggested by Livingston and Tott Ingham^ ^ , 



(3 ) 



'Livingston, B.R., and. Tott Ingham, V/.E. A 



new three-salt solution for plant cultures. Amer. Jo\ir. 



Bot. 5:357-346, 1918. 



