-23- 



A thorou{ih study of all the series of cists' leads 

 to a similai' conclusj.on for the other series. i:0 consistent 

 evidence was an^nivhere clearly discernable bet?;een salt pro- 

 portions and the mean hourly grov;th rate for the entire culture 

 period. Several suggestions of certain relations between grovith 

 and the composition of the nutrient solutions were encountered, 

 ^ 'but careful study of the nuriericel data end the extent of 

 the variability encountered with this seed leads to the con- 

 clusion stated above. This conclusion of course applies only 

 to the tests here considered, dealing with the very first 



(6) 



In a preliminary paper/ the author reported on 



one of these suggestions, interpreting the datfi to show that 

 nutrient solutions having a relatively high potassium-ion 

 proportion were / relatively poorer growth media for these 

 wheat seedlings at high temperatures than they were at low 

 temperatures; and that, at low temperatures, nuti'ient 

 solutions high in potassium-ion proportion v;ere relatively 

 better for growth than they were at high tem.peratujpes . It 

 v/as stibsequently found that a more rigid method for defining 

 the "best" solutions (as shovm infc^ble II of this paper) 

 resulted in the elimination of some of the solutions reported 

 as "best" in the preliminary paper. The suggestion here con- 

 sidered has proved to be of value, however, and it has led to 

 further and more comprehensive experimentation along this line, 

 but v/ith longer grovfth periods. Selected solutions of the 

 a-ix types were tested, each one in a set of at least ten like 



