136 



BOTANICAL GAZETTE 



[august 



which indicate departures from the best condition of the organism. 

 A temperature in excess of the normal generally indicates an 

 infection; a subnormal temperature, on the other hand, indi- 

 cates lessened vigor. Decreased vigor is very generally due to 

 increased age. 



norma 



some 



grams 



them 



crop 



with 



of 191 1 and experimented 

 academic year 1911-1912. Inspection of the figure 



Hemp (i?8 2 C.) 



Barley (o?88 C.) 



Clover (o?75 C.) 



Oats (o?55 C.) 



Corn (o?49 C.) 



Fig. 18. — Showing the average daily heat yield in terms of 10 grams; 191 1 seed 



ws, for example, that a temperature curve indicating normal 



germinating 

 germination 



oats would mean 



than 50 per cent 



the "normal" temperatures are accom 

 amounts of growth immediately followii 



mination 



may 



animals 



xperiments does no more 



Leland Stanford Junior University 

 Stanford University, California 



