Table 5 



Contents of total water and fat and total nitrogen in the dry substance of the beetle's body 



In combined breeding (Tables 6 and 7) it was ascertained that photoperio- 

 dism acts quite distinctly on beetles. One can also notice, however a certain 

 influence of the length of the day transfered through the larvae to the beetles. 



The length of the day plays hence a decisive role in life processes of the Colo- 

 rado beetle for which this action has the character of a direct stimulus. 



234 



