l62 



SENESCENCE AND REJUVENESCENCE 



confirmed by the estimations of carbon-dioxide production. In 

 rate of carbon-dioxide production the starved, reduced animals 

 resemble young rather than old animals, such as they were before 

 starvation. 



THE RATE OF DECREASE IN SIZE DURING STARVATION 



When the animals are kept entirely without food the rate of 

 decrease in size shows in general an increase, at least during the 

 later stages of starvation. Thus far only incidental observations 

 have been made concerning this point, the approximate lengths of 

 lots of animals being noted as they were removed from time to 

 time for determination of the susceptibility. But even in these 

 measurements the differences in rate of decrease in size appear, 

 though with some irregularities, and in most cases the increase in 

 rate in the later stages of starvation is evident without measure- 

 ment. Table III, for which the data are given in Table II (p. 157), 

 gives the average length of the animals in a starvation stock at 

 monthly intervals, and Table IV gives similar information, but 



TABLE III 



TABLE IV 



from a stock of animals of smaller size before starvation. In 

 Table III the average decrease in length during the first month is 

 about 30 per cent, during the second about the same, and during 



