i6o 



Hcrcdiiy 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 

 ha\'ing 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 exneriment. 



Generations 



I 



II 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



Experiment 27^, Control 

 Kept in Normal Conditions 



...276 

 ,...276 



. 276 



. 2jb 

 . 276 

 .276 



. 27& 



.276 



.276 



27?)' 



2jb^ 

 276' 



■^ 



Experiment 27a, Subjected 

 to Conditions of Experiment 



27a 



2ya 



2 7a^ 



2ya^ 

 27a' 



27d^ 



'jL. 



27a 

 27a 



27(2 



27a 



m 



27a"' 



27(7'" 

 27(J' = 



2711 

 27a' 

 27a' 



27a' 



27a" 

 27a'' 



270' 



lb 



Fig. 60. — To sliow the different purth ol an e.xjjeriment, in wln( li L 

 deccmlinenla was suljjected to conditions u'liich would modify the soma without 

 modif\'iiiK the germ plasm. The generations underscored were subjected to the 

 conditions of the cx[)erimeiit; those not underscored were kept in natural 

 surmundings. 



