









p 



1917] 



GROVES— DURATION OF SEEDS 



175 



stem had broken through the seed coat. When only the root or 

 the shoot appeared, the seeds were considered partially germinated. 

 Partial germination is represented in this table by the figures 

 in small type. The delay in time of germination as the time of 

 exposure increased is strikingly shown here. The controls usually 



TABLE I 





> 



Record Sheet No. 21 



Temp: 87. 5 'C. Moisture 



Turkish Red Wheat 

 April 10, /9I4. 



EH^i i£ 



Cont/vt 



7 Mm. 



dM/n 



9M/n 



lOM/n 



H Mm 



/2Min 



l3M/n. 



92 92 



o 



o 



98 98 



/o // 



/J 



/4 



/7 



/£> 





98\98 



98 98 98 



98198 





SS 6/ 



64167 



■f 



7a\7e 7e 72 73 74 



6 



/0\e5\30 35 





/ 



/ 



/ 



/ 



59\59 





8 /O 



4 



Rgr \Cen? 



/&►/■ W/t 



v 



fbr Cent \5er/7?>'r?0. 



vr/i 



/ 



/8 25 28 32 



4 





j 



o 



o 



O O 



germinate in about 2 days, while some of the treated seeds were 

 delayed for 18-20 days. The relation between time of heating and 

 the percentage of germination is shown in the table. There is a 

 gradual decrease in the percentage of germination with increased 

 time of heating. After the delayed seeds germinate their growth is 

 much slower than that of unheated seeds. It should be noted 

 that the effects here of heating are similar to those produced by 

 the aging of seeds stored at room temperature. This indicates 



