DIGESTIBILITY OF MISCELLANEOUS ANIMAL FATS. 



11 



composite fat taken from different parts of the body. Through the 

 courtesy of Superintendent Hollister, of the National Zoological 

 Park, a supply of horse fat (neck and leaf) was secured from a 

 healthy inspected animal, such as are regularly procured to supply 

 food for the carnivorous animals confined in the park. In the un- 

 rendered form its physical appearance was so similar to that of beef 

 fat that the members of the laboratory staff who were unaware of its 

 source assumed it to be beef fat. Samples of the neck and leaf fats 

 which were analyzed by R. H. Kerr, of the Bureau of Animal In- 

 dustry, were found to have the following constants : Neck fat, iodin 

 number 95.83 and refractive index at 40° C. 55.5° and leaf fat, iodin 

 number 91.22 and refractive index at 40° C. 54.0°. The unrendered 

 fats were passed through a meat cutter, uniformly mixed, and ren- 

 dered in a double boiler. The rendered fat on standing tended to 

 separate into an oily and solid layer, resembling chicken fat in this 

 respect. 



Three subjects assisted in the experiments, which are reported in 

 the tables which follow : 



Data of digestion experiments with horse fat in a simple mixed diet. 





Weight 

 of foods. 



Constituents of foods. 



Experiments, subjects, and diet. 



Water. 



Protein. 



Fat. 



Carbohy- 

 drate. 



Ash. 



Experiment No. 747, subject P. K.: 



Grams. 



1,634.0 

 304.0 

 514.0 

 265.0 



Grams. 



734.2 



27.4 



446.7 



Grams. 



33.0 



32.2 



4.1 



Grams. 



184.0 



4.5 



1.0 



Grams. 



669.1 



235.0 



59.6 



265.0 



Grams. 

 13.7 





4.9 



Fruit 



2.6 



Sugar 

















2,717.0 

 67.0 



1, 208. 3 



69.3 

 22.3 

 47.0 



189.5 



9.4 



180.1 



1,228.7 



29.9 



1,198.8 



21.2 





5.4 







15.8 

















67.8 



95.0 



97.6 



74.5 











Experiment No. 748, subject M. L. M.: 



1,670.0 

 558.0 

 667.0 

 429.0 



750.3 



50.2 



579.6 



33.7 

 59.2 

 . 5.4 



188.1 



8.4 

 1.3 



683.9 



431.3 



77.4 



429.0 



14.0 





8.9 



Fruit 



3.3 



Sugar 















Total food consumed 



3,324.0 

 133.0 



1,380.1 



98.3 

 40.8 

 57.5 



197.8 



13.2 



184.6 



1,621.6 



68.3 



1,553.3 



26.2 





10.7 







15.5 

















58.5 



93.3 



95.8 



59.2 











Experiment No. 749, subject J. C. M.: 



Blancmange containing horse fat 



1,719.0 

 385.0 

 948.0 

 194.0 



772.4 



34.6 



823.8 



34.7 



40.8 



7.6 



193.6 

 5.8 

 1.9 



703.9 

 297.6 

 110.0 

 194.0 



14.4 





6.2 



Fruit 



4.7 



Sugar 

















3,246.0 

 123.0 



1,630.8 



83.1 

 37.4 



45.7 



201.3 



15.3 



186.0 



1,305.5 



59.8 



1,245.7 



25.3 



Feces 



10.5 







14.8 

















55.0 



92.4 



95.4 



58.5 











Average food consumed per subject per day . . . 



1,032.0 



468.8 



27.9 



65.4 



461.8 



8.1 



