12 



ARON. 



Table 3, Experiment I. — Weight of skin in per cent of Jive iveight of dog.i 



II to IV. 



Dog number— 



Fresh. 



Dry. 



II . . _ . 



Per cent. 

 13.6 



Per cent. 

 5.35 





III > 



14.6 



5.09 





IV . 



12.0 



4.21 





Table 4, Experiment I. — Composition of bodies of dogs I to IV. 





Dog number— 



II. 



III. 



Weight. 



Per cent of— 



Weight. 



Per cent of— 



Body 

 weight. 



Live 

 weight. 



Body 

 weight. 



Live 

 weight. 



Fat-_ 



Grams. 



30.7 



167.0 



47.8 



68.3 



882.2 



2.5 



13.9 



3.9 



5.7 



74.0 



1.6 



8.6 



2.46 



3.52 



45.4 



Grams. 



21.8 



168.0 



42.2 



6L5 



839.5 



1.9 



14.9 



3.7 



5.4 



74.1 



1.3 

 9.6 

 2.42 

 3.52 



48.1 



Protein of muscles ._ 



Protein of bones 



Ash of bones 



Rest= (water, ash of 

 muscles, etc.) 





Dog number— 



IV. 



I. 



Weight. 



Per cent of— 



Weight. 



1 

 Per cent of— 



Body 



weight. 



Live 

 weight. 



Body 



weight. 



Live 

 weight. 



Fat 



Grams. 



107.8 



289.0 



49.5 



64.9 



1,474.7 



5.4 



14.5 



2.5 



3.3 



74.3 



3.8 



10.2 

 1.74 

 2.28 



51.7 



Grams. 



309.9 



382.5 



105.5 



96.4 



2, 14.5. 7 



10.2 



12.6 



3.5 



3.2 



70.5 



6.7 

 8.0 

 2.29 

 2.10 



46.7 



Protein of muscles — 



Protein of bones 



Ash of bones 



Rest=( water, ash of 

 muscles, etc.) 



Experiment No. II. — Two dogs of strikingly similar appearance from 

 the same litter were used for the second experiment, which began on 

 January 21, 1909. Number V weighed 2,200 grams; VI, 2,750 grams. 

 The mother of the dogs was a large animal. Both animals passed 

 through a preparatory period of three weeks during which, by giving 

 different quantities of food, they were brought to nearly the same weight. 



