250 Dr. W. Marcet and Mr. R. B. Floris. An Experimental 



Calories emitted in one hour and corresponding Oxygen absorbed. 

 E. R. under experiment. Age 28 ; weight 80'4 kilograms. 



These lists include thirty-six experiments on three different persons, 

 in all of which the oxygen taken from the air, while in the chamber, 

 was determined. At the outset a striking similarity is observed 

 between the means of the calories produced for 1 gram of oxygen 

 absorbed. 



(Mean of 17 exp.) 

 ( 13 ) 

 ( 6 ) 



With W. M. that figure is 4042 



R. B. F. ... 4022 

 E. R. . 3916 



It is, therefore, obvious that there is a definite relation of cause 

 to effect in the absorption of oxygen towards the production of 

 animal heat. These figures must not be considered as absolutely 

 final ; they show that under similar circumstances relating to time 

 of food, &c., the mean calories produced for 1 gram of oxygen absorbed 

 are the same for different persons, at all events as far as can be 

 gathered from the three subjects experimented upon ; and, moreover, 

 it may be concluded that the true figure closely approximates 4000 

 (small calories). Him, from his experiments, gives 5'22 large 

 calories for 1 gram of oxygen absorbed, which exceeds our figure 

 (4'00) to a marked extent. 



If the volume of oxygen absorbed from the air was proportional to 

 the calories given out during the same time, then, by placing iu a 

 tabular form the numbers for the calories found, beginning with the 



