51 



Table 23. — Results of digestion experiment No. 468. 



Lab- 

 ora- 

 tory 

 No. 



6783 

 6784 

 6746 

 6750 

 6752 

 6787 

 6788 

 6789 

 6790 

 6791 

 6792 

 6793 

 6794 

 6795 

 6796 

 6798 



6802 



Kind of food. 



Corned beef, boiled.. . 



Roast beef - 



Pork chuc-k, salt 



Codfish 



Butter 



Baked beans 



Cabbage, boiled 



Potatoes, boiled 



Vegetable soup 



Biscuit - 



Sugar cookies 



Sugar doughnuts 



Molasses cookies - 



Gingerbread 



Molasses doughnuts . . 



Mince pie 



Sugar 



Sirup .-- - 



Weight 

 of mate- 

 rials. 



Grams. 



2.50.0 



544.0 



114.0 



385.0 



ft5.4 



2,1.50.0 



710.0 



2,40.5.0 



1,828.0 



2,821.0 



560.0 



443.0 



35.0 



121.0 



132.0 



131.0 



468.0 



99.0 



Total 

 organic 

 matter. 



Protein 



(Nx 6.2.5). 



Grams. 

 146.10 

 220.40 



81.. 50 

 144.60 



82.00 

 800.90 



89.80 

 556.80 

 2.55. 80 

 l,8.3;iO(J 

 466.40 

 375.90 



27.40 



93.10 

 106.20 



82.30 

 468.00 



69.60 



Total I 13,291.4 I 5,899.80 



Feces 



Amount digested 



Per cent digested 



Energy of urine ... 



Energy of food oxi- 

 dized in the body . . . 

 Per cent of energy 

 utilized 



208.6 



188.40 



5,711.40 



96.81 



Fat. 



Cr'CO »i.S. 



2.5.10 



176. 50 



4.70 



117.80 



.30 



173.90 



10.90 



45. 70 



ft5. 60 



186. 80 



31.80 



20.40 



1.90 



7.10 



6.20 



6.20 



Carbohy 

 drates. 



Grams. 

 95.40 

 43. 90 

 75. 60 

 25.70 

 71.70 



161. 70 



29.30 



.70 



42.90 



192. 70 

 6.5.30 



119.80 



3. .50 



10.20 



26.10 



14.90 



2. .30 



883.20 



106.70 



776. 50 



87.92 



980.40 



21.10 

 9.59. 30 



97.84 



Grains. 

 24.60 



i'-lo 



1.10 



10. 00 



4a5. .30 



49.60 



510. 40 



147.30 



1, 4.53. .50 



369. m 



235.70 



22.00 



7.5.80 



73. 90 



61.20 



468.00 



67.30 



Ash. 



4,036.20 



60.60 



3,975.60 



98.59 



Grams. 



9.00 



9.9fl 



7. 00 



32. 30 



.5.10 



67.10 



18.90 



18.70 



25.20 



14.70 



3.90 



2.00 



.80 



2.30 



1.40 



.70 



3.10 



222.10 



20.20 



201.90 



90.90 



Energy. 



Calories. 



1,113.00 



1,13(5.00 



698.20 



900. .30 



690.00 



4,419.00 



520. 40 



2,352.00 



1,382.00 



9,017.00 



2,081.0(J 



2,147.00 



13.5.30 



4.50.20 



.591.20 



307.80 



1,842.80 



276. 70 



130,069.90 



1,122.70 



28,947.20 



96.37 



970.60 



27,976.60 



93.00 



METABOLIC PRODUCTS IN THE FECES. 



The feces are not made up entirel}' of undigested food residues, 

 but contain quite a large amount of other waste materials, usually 

 termed metabolic products. As ordinarilj' used, however, this term 

 not only includes the metabolic products, strictly speaking, such as 

 the residues from the bile, mucus, saliva, gastric, pancreatic, and 

 other digestive secretions, but also includes worn-out particles from 

 the mucous membrane, lining of the intestines, other debris from the 

 walls of the stomach, and, perhaps, larger or smaller quantities of 

 specifically excretory matters. The results of other investigations 

 indicate that the digestion of food materials is more complete and the 

 proportion of metabolic products in the feces larger than was for- 

 merly supposed. Tt is not at all improbable that during the processes 

 of natural digestion, aided by careful preparation of the food and 

 proper mastication, practically all of the nutrients of most foods are 

 rendered absorbable in the alimentary canal, and that undigested 

 residues are rather accidental than incidental. In view of the impor- 

 tance of this subject the metabolic nitrogen of the feces in these 

 digestion experiments has been studied by the same method as in the 

 past. The metabolic nitrogen was determined by two methods 

 described in detail in a previous bulletin of this Office." In the first, 

 the metabolic products are removed by digestion witli pepsin solu- 

 tion, and in the second, by treatment with ether, alcohol, hot water. 



«U. S. Dept. Agr., Office of Experiment Stations Bui. 85. 



