1917] 



GROVES— DURATION OF SEEDS 



177 



b 



Fig. 2 is a time 



curve representing the experi- 



mental data shown in table II for wheat with 12 per cent 



w 



40 



6C 



90 



/OO 





J40 



60 



/6C 



^oo ex 



e*o 



eoo Xfo 



Fro. 2 



TABLE II 



Germination record of Turkey-red wheat 12 per cent moisture; theoretical 

 temperature calculated by the formula T—a~b\ogZ; T is temperature (Centigrade); 

 Z is time in minutes; a and b are constants; = 96.87; 6=10.4; value of Q> as cal- 

 culated by method of least squares = 10. 14. 



Time in minutes 



7 



8 



9 

 10 



18 



45 

 So 



5° 

 120 



315 



Calculated 

 temperature 



Experimental 

 temperature 



88. 



87. 



87. 

 86. 



84. 



S3- 



79 



79- 



79- 



75- 

 70. 



i°C. 



s 



o 



5 

 6 



7 



7 

 2 



2 



2 



9 



Q 



10 



89 



. 2° C.| 



87 



■7 



87 



5 



87 



5 



84 



4 



84 



4 



78 



9 \ 



79 



1 



78 



5 



75 



8 



7i 



3 J 



6.0Q 



(10 3) 



12.94 



(7-6) 



Predicted life duration: 50* C, about 22.3 days; 25 C, about 15.5 years; 20 C, about 46.9 

 ; o°C, about 393 years. 



moisture 



orclinates 



degrees Centigrade and the 



time. Except for 



gularities which 



