10- 



. EXreRIMENTATION. 

 Materiels end Methods ^ 



The wheat used was 8 spring wheet^of the "Mar- 

 quis" 'variety, crop of 1918, purchased by the Committee 

 on Salt Requirements of Agricultural Plants, from the 

 University Farm, University of Wisconsin. The ae^ds 

 were not as uniform as work of this kind requires, and 



hence ell seeds used in this investigation v,'ere selected by 



and uniformity 



hand and eye for apparent normality/ Even v/ith this precsu- 



A 



tion, considerable variation ■was encountered, rot only in the 

 percentage ©-f viability of the seed, but also in the grov^th 

 rate of the shoots. It was thought, however, that the sel- 

 ected grains probably exhibited no greater variability (dif- 

 ferences in internal conditions) than is generally shown by 

 agricultural seed vrheat of this variety. 



Ths distilled water used for the nutrient solutions 



We 



was obtained from / Barnstead still of the Laboratory of Plant 



Physiology of the Johns Hopkins University. 



The salts used for the nutrient solutions were of 

 the grade of Baker's Analyzed Chemicals, C.P. 



The nutrient solutions used all agreed in having 

 a total concentratir-n corresponding to about 0.1 atmosphere 

 of osmotic pressiore. They are, tlierefore, to be classed 

 as relatively dilute. The six solution types differed in 

 regard to the three salts used in each, as has been shown 

 above, but all six types agreed in containing the six 



