LIFE PROCESSES : SIZE OF BODIES AND ORGANS 



9 



ment, and the excessive temperature of 1923. The effects of 

 inadequate general care, as indicated on the chart, may also 

 have been a factor contributing to the reduced body weights 

 shown by the several generations from G r , to G 8 . 



Yeor 



'20 



G 7 



G 8 G s 



'22 



'23 



.Great 

 heat 



Chart 1 Showing birth date and killing date for each generation of captive 

 Grays and indicating the incidence of unfavorable conditions. 



