No. 560] INFLUENCE OF FASTING ON GROWTH 485 



the control animals would have done with the same 

 quantity of food. Taking the average for all four groups 

 together, we find that the intermittently fed specimens 

 with one half the amount of food reach a little over two 

 thirds of the body weight of the continually fed ones. 



Assuming the values for the normally fed animals equal 

 to 1, we may sum up the results of our comparison of the 

 growth in weight of continually fed individuals (a) and 

 those starved (b) or intermittently fasting (c) in the fol- 

 lowing formulae : 



The results of the above study are obviously at variance 

 with those of von Seland who found that his periodically 

 fasting birds have been faring best. This difference in 

 our results may, of course, be accounted for by the cir- 

 cumstance that the periods of fasting of my salamanders 

 have been rather long (one to three weeks; also in 

 Kalian's experiments the periods were from one and a 

 half to two weeks) whereas von Seland 's chickens have 

 never fasted more than 12 to 48 hours at any time. 



