20 



ARON. 



first it received 110, then 130, and, finally, from the one hundredth day, 

 175 calories per day. Its body weight increased so little that it conld 

 be regarded as practically constant. 



Experiment IV. — Dogs A to D. 



Day 



Weight 



7600 

 7400 

 7200 

 70<I0 

 6800 

 6flOO 

 6 400 

 6 2 00 

 GOOO 

 5 BOO 

 5 6 00 

 5 400 

 S200 



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 4000 



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Chart 4.- 



-Variations in weights of and amounts of food taken by dogs A to D 

 of Experiment IV. 



The animal in every respect presented the same type of development as 

 number VI. It gradually became thinner, taller, and longer to the 

 two hundredth day, when it no longer changed in appearance. The 

 animal consisted mainly of skin and bones, but it still had enough muscle 

 to enable it to move with vivacity, in fact it was more active than dog 

 B, although the latter was three times as heavy. A photograph of both 

 dogs was taken on February 15, the one hundred and ninety-ninth day. 

 This, better than any description, shows the difference in size and ap- 

 pearance of the two animals.' (See Plate II.) 



The dogs were kept for about one hundred and fifty days longer. 

 Dog A continued to receive the same diet. The diet of B was increased 

 to 680 calories per day. The body weight of dog A remained practically 

 constant and the dog did not change appreciably in general appearance. 



