i6o 



Heredity and Eugenics 



TABLE I 

 Temperature and Humidity Conditions 



*Dew. 



In this series of experiments 21 per cent died in the larval stage 

 and 9 per cent in the pupal, while 70 per cent appeared as imagines with 

 the proper color modifications. Throughout, the whole series the 

 greatest care was taken to prevent the conditions of experiment from 

 having any possible influence upon the germ cells in their growth periods 

 and during maturation and fertilization. This was accomplished by 

 removing the adults to normal conditions during the period of germ- 

 cell growth and fertilization, the fertilized eggs being returned as soon 

 as laid to the conditions of experiment. 



Generations 



I 



II 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



Experiment 27ft, Control 

 Kept in Normal Conditions 



. . .276 



. . .276 



Experirnent 27a, Subjected 

 to Conditions of Experiment 



27a 



27a 



.276 



.276 

 . 27& 



. 27& 



L 



2-jb 



276^ 



276' 

 276' 



^ I 



27a 



, 276 



, 276 



276 



270^ 



270* 

 27a* 

 270^ 



22£ 



270 

 27a 



27a 



27a 

 270 

 27a 



-J. 



27a 

 27c* 

 27a' 



27c' 



27 a" 

 27a'* 

 27a" 



27a 

 27a 



tb 



lb 



lb 



270 



Fig. 60. — To show the different parts of an experiment, in which L. 

 decemlineata was subjected to conditions which would modify the soma without 

 modifying the germ plasm. The generations underscored were subjected to the 

 conditions of the experiment; those not underscored were kept in natural 

 surroundings. 



