CONSTANCY OF ENERGY KATABOLISM. 15 



Constancy of katabolism of fasting animals — Rubner. 



. - 



Day oi lasting. 



Guinea pig. 



Dog. 



Rabbit. 



Protein ka- 

 tabolism in 

 per cent of 

 total ka- 

 tabolism. 



Heat pro- 

 duction 

 per kilo- 

 gram. 



Protein ka- 

 tabolism in 

 per cent of 

 total ka- 

 tabolism. 



Carbon 

 dioxid per 

 kilogram. 



Protein ka- 

 tabolism in 

 per cent of 

 total ka- 

 tabolism. 



Carbon 

 dioxid per 

 kilogram. 



First 





C alories. 

 149. 9 

 162. 6 

 156. 5 

 140.5 

 137.3 

 150.6 

 157.4 

 155.6 

 162.6 





GvdTflS. 

 on 70 



ZU. /U 

 Li . OO 





Grams. 



Second 



10. 4 



11. 1 

 11.0 

 11.9 

 11.8 

 6.9 

 11.2 

 10.9 









Third 



16. 3 



16.5 





Fourth 



17.99 





Fifth 





| 23.6 



j 17.26 



Sixth 













1 15.90 









Ninth 







) * 



j 29.8 



50.1 

 } 96.4 



f 15. 90 

 1 15. 65 



Tenth 



| 13.1 



15. 5 

 17.4 

 20.0 



/ 18. 70 

 \ 17.86 

 16. 13 

 17. 06 

 16. 12 









Twelfth 







1 17. 18 

 15. 81 

 \ 15. 95 

 [ 15.90 



Thirteenth 













Fifteenth 







Sixteenth 











Seventeenth 



:::::::::::: 



































Benedict 1 lias obtained like results for the heat production of man as meas- 

 ured directly by means of the respiration calorimeter. For example, in an 

 experiment 2 covering seven days the following quantities of energy were ka- 

 tabolized daily. 



Constancy of katabolism of fasting man — Benedict. 



Day of fasting. 



Energy 



from 

 protein. 



Energy 

 from fat. 



Energy 



from 

 glycogen. 



Total 

 energy. 



Energy 

 per kilo- 

 gram 

 body 

 weight. 



Protein 

 katabo- 

 lism in 

 per cent 

 of total 

 katabo- 

 lism. 





Calories. 



Calories. 



Calories. 



Calories. 



Calories. 



Per cent. 



First day 



318 



1, 175 



272 



1,765 



29.7 



17.7 



Second day 



286 



1,385 



97 



1,768 



29.9 



16.0 



Third day 



303 



1,471 



23 



1,797 



30.8 



17.0 



Fourth day 



248 



1,422 



105 



1.775 



30.8 



14. 3 



Fifth day 



221 



1,394 



34 



1.649 



29.0 



13.5 



Sixth day 



218 



1,244 



91 



1, 553 



27.5 



14. 1 



Seventh day 



204 



1,2S6 



78 



1,568 



2S.0 



13.2 



This constancy of the fasting katabolism evidently is in accord 

 with the conception of it outlined on page 9 as the measure of the 

 energy necessary to carry on the vital activities of the body. The 

 functions of circulation, respiration, excretion, etc., must go on con- 

 tinually in a state of so-called rest, the muscular tonus must be 

 maintained and divers minor muscular movements executed. In 

 the aggregate all these result in the expenditure of a relatively 

 uniform amount of energy from day to day. This energy in the 



1 The Influence of Inanition on Metabolism. Carnegie Institution of Washington, 1907, 

 Publication No. 77. 



2 Experiment No. 75 on S. A. B., pp. 188, 483, and 496. 



