TRANSITIONS IN MORPHOLOGICAL CHARACTERS 



105 



rate of reproduction was resumed. But the results of low nutri- 

 tion and of mere quantitative food change were again negative 

 so far as producing the humped type was concerned. 



TABLE 5 

 Starvation of race 



Effect of pure starvation and subsequent feeding 



To test the effect of temporary but entire starvation, about 

 one-hundred-and-fifty individuals, taken shortly after birth, were 

 isolated in the customary medium to which no food was added. 

 After about ten hours they were fed. The result was a retarded 

 reproduction, although after food was again given, the number of 

 young born approximated the normal. Again no humped indi- 

 viduals were produced, the saccate type remaining constant. 



Reproductive capacity in sisters 



Although an earlier experiment (tables 1 and 3) indicated 

 that, under normal conditions, the progeny o£ earlier and later 

 sisters and even the series bred from them, were essentially 

 similar, yet, in the above experiment on total starvation during 

 the growth period, certain observations suggested a different 

 method by which possible differences could be demonstrated 

 between such sisters. It was noted that in some young Individ- 



