-bV 



appai'ently better as a germination medium than v^as distilled 

 water. For the lov.est tempei-atur e vised (13*^), how* ver, 

 distilled water is indicated as just as satisfactory as 

 the solutions. 



(5) Despite the great degree of Internal 

 variation in the seed used, the usual tempe ratio's inflvience 

 was clearly brought out with regard to the rate of shoot 

 elongation. The influence of maintained temperature 

 was so great that it far surpassed the influence of 

 internal variation. All the solutions used with any 

 temperatijre v/ere treated as if they had been just alike, 

 and an average hourly rate of shoot elongation was obtained 

 for each of the seven temperatures used. These average 

 ho\irly rates are as follov^s in terms of hundredths of a 

 millimeter : 



not Temperature, Centigrade. 



130 170 210 250 28^ 31° 35° 



9.5 23 32 40 42 31 



85 112 137 157 153 124 

 25 42 55 66 67 53 



The optimum temperatiire , as shown by these averages, lies 

 between 28° and 31°, probably between 29° and 30°. 



