-66- 



of course , Influenced by temperature , and in a marked 

 way, though this relation was not quantitatively 

 studied. 



(3) 50 significant relation between the salt 

 composition of the medium was clearly apparent. Tfhat ever 

 influence might have been exerted by these environmental 

 features was masked by the influence of the relatively 

 large internal variation ehorni by the several lots of 25 

 seeds. For later developmental phases, or perhaps for 

 these early stages of growth , with this same kind of seed 

 if its internal variability were much lower , relations 

 between growth rate and the composition of the medium 

 may be expected to become manifest. 



(4) For all temperatures, excepting the lowest 

 here used (13 C.), distilled water as a medium appeared 

 to give rates of shoot elongation for the entire culture 

 period f about 110 hours) that were only about half as large 

 as those given by the nutrient solutions. Although the kind 

 of solution was apparently without significant inflxience on 

 the elongation rates of these shoots, and any solution 



must therefore be regarded as just as promising as any 

 other in this respect, yet any one of these solutions was 



