304 



ELLINOR HELENE BEHRE. 



TABLE VII. 



WORMS WHICH HAVE BEEN LIVING FOR A NUMBER OF MONTHS IN THE LABORA- 

 TORY AT MEDIUM TEMPERATURE, REGULATING AT Low. 



normal and 76 per cent, teratophthalmic in the control, the rise 

 in temperature for regulation alters this head-frequency to 86 

 per cent, normal and 14 per cent, teratophthalmic. In the B 

 pieces the control shows no normals, 40 per cent, teratophthalmic, 

 and 52 per cent, anophthalmic with 8 per cent, teratomorphic 

 and headless together, while the rise in temperature alters 

 this head-frequency to 56 per cent, normal, 42 per cent, terato- 

 phthalmic and only 2 per cent, of the lower types. In C pieces 

 a similar increase in head-frequency results from a rise in tem- 

 perature. Table VII. shows a great decrease in head-frequency 



TABLE VIII. 



WORMS WHICH HAVE BEEN LIVING FOR ALMOST Two MONTHS IN THE LABORA- 

 TORY AT MEDIUM TEMPERATURE, REGULATING AT HIGH. 



as the result of regulation at a lower temperature than the living 

 temperature. And Table VIII. shows an increase in head- 

 frequency as the result of regulation in a temperature higher than 

 the living temperature. 



