2 3 8 



WILLIAM LAWRENCE TOWER. 



TABLE VII. 



SHOWING IN THE ORIGINAL CULTURE OF L. decem-lineata No. 100, AT CHICAGO. 

 TESTS MADE TO DETERMINE THE ELIMINATION IN THE HIBERNATING POPULA- 

 TION, IN PREPARATION FOR HIBERNATION, THE NUMBER THAT HIBERNATED, AND 

 THE PERCENTAGE ELIMINATED DURING HIBERNATION, WITH THE PERCENTAGE 

 OF SURVIVALS IN THE FOLLOWING SPRING. 



Stock Culture No. 100, Chicago. 



the ground in the tube, but what the cause of the elimination is 

 has not been determined, and may possibly not be possible 

 of determination as the population will not breed until after 

 hibernation and it is therefore impossible to attempt to get a 

 culture of these individuals for further testing, and further 

 there are no indications that have been detected that they are 

 in any way different from the remainder of the tested population. 

 Moreover the sample for testing has always been drawn from 

 the stock culture, in an absolutely impersonal manner and at 

 random so that the elimination may for the present be regarded 

 as a chance elimination in the preparations for hibernation, of 

 about the same value in each hibernating generation, therefore 

 of no probable modifying action upon the population. 



From the same table it appears that during hibernation there 

 is on the average an elimination of nine and one half per cent. 



