134 



BOTANICAL GAZETTE 



[august 



germination with the increasing age of the seed. The younger and 

 more viable seeds sprout more promptly and produce a greater 



Fig. 15.— Wheat in flasks: A, no. 114; B, no. 1746; C, no. 791; Z>, no. 639: 



E, no. 98. 



early growth than the older ones. The accompanying graphs (tigs. 

 15-17) facilitate a comparison of the results as indicated in the 

 foregoing tables. 



Summary 

 Our experiments with seeds of different known ages indicate that 



one may re* 

 germinating 

 d lately folic 



germination 



temperatures 



which they will develop in silvered Dewar flasks un< 

 suitable for germination. 



Each species of plant which we have studied appears to have, 

 like the higher animals, a "normal" temperature, departures from 



