NUTRITION AND GROWTH: I. 19 



Table 11. — Fat and protein in organs and muscles of dogs VIII, XI, XII. 





Dog VIII (2,375 

 grams live weight) . 



Dog XII (3,000 

 grams live weight) . 



Dog XI (1,100 

 grams live weight). 



Weight. 



Per cent 

 of live 

 weight. 



Weight. 



Per cent 

 of live 

 weight. 



Weight. 



Per cent 

 of live 

 weight. 



Fat in muscles 



Fat in organs 



Total fat 



Protein in muscles ._ 

 Protein in organs 



Total protein.. 



drams. 

 51.9 

 21.6 



2.2 

 0.9 



Grams. 

 30.1 

 19.9 



1.0 

 0.7 



Gi'ams. 

 7.0 

 4.3 



0.6 

 0.4 



73.5 



3.1 



50.0 



1.7 



11.3 



1.0 



155.9 

 61.0 



6.6 

 2.6 



229.4 

 78.6 



7.6 

 2.6 



54.0 

 31.9 



4.9 

 2.9 



216.9 



9.2 



308.0 



10.2 



86.1 



7.8 



Experiment No. IV. — Experiment number IV was the most successful 

 one. Four dogs (A, B, C, D) of the same litter, about 5 weeks old, 

 were treated with thymol early in July, 1909, and prepared for the 

 experiment. The animals were as nearly alike as could be desired in size 

 and general appearance. The experiment began August 1, 1909. On 

 the fortieth day the four dogs were of nearly the same weight and were 

 photographed. On the forty-fifth day, dog D was killed and analyzed 

 for comparison. (See Table 13.) Dog B was allowed to grow as rapidly 

 as possible; dog C was not given as abundant a supply of food as B, 

 and dog A was fed only a sufficient amount to keep his body weight 

 constant. 



The mineral constituents of the food were disregarded in the experi- 

 ments described above. If a young, rapidly growing dog is fed a diet 

 of meat and starch such as was used in these experiments, it very probably 

 will receive an insufficient supply of calcium salts. In order to remove 

 this possible source of error there were added to the daily food of each 

 dog from 1.0 to 1.5 grams of calcium phosphate in addition to the sodium 

 chloride. 



The experiment progressed smoothly so far as dogs A and B were 

 concerned (see Table 17), but on the one hundred and twenty-second 

 day dog C was taken ill suddenly and died in about twenty hours. The 

 cause of death could not be determined at autopsy ; it may have been 

 distemper. 



Dog B, which received from 400 to 680 calories daily, increased in 

 weight from 1,500 grams (3,000 on the fortieth day) to about 7,400 

 grams on the five hundredth day. 



Dog A was not kept on quite so low a diet as the other animals (VI, 

 XT, and XIV) , the body weights of which were to remain constant : at 



