IIYDATIXA SENTA SUBJECTED TO ENVIRONMENT. 



325 



hypothesis of inactivity some fertilized eggs of race A while still 

 in water were kept at -70 C. for twenty-four hours. Other 

 fertilized eggs were dried and kept in liquid air 1 at a temperature 

 of about -191 C. for four days. Both lots of these eggs were 



TABLE III. 



hatched and the rate of reproduction of the developing females 

 compared with that of the control. Tables IV. and V. show that 

 no reinvigoration had taken place. 



Some dried fertilized eggs were placed at a high temperature 

 of +100 C. for six hours. Table VI. shows that race A was not 

 stimulated by this high temperature. 



1 I am greatly indebted to Professor W. P. Bradley, of the department of chem- 

 istry of Wesleyan University, for his kindness in personally manufacturing and do- 

 nating the numerous liters of liquid air which were used in these experiments. 



