Heat-production Associated with Muscular Work. 



103 



In each figure the different curves of each set (A, B, C) have the same 

 meaning. Thus the lowermost always represents the heat-production, etc. 

 Their examination will show that the experiments have been balanced so as 

 to yield a general average such that in it the rectal temperature is 

 practically uniform throughout, and is represented by what is almost a 

 straight line (fig. A). It follows, therefore, that the underlying curve of heat- 



-35°C 



production is practically devoid of any corrections due to alterations in the 

 temperature of the subject. Nor will any modification in my system for 

 dealing with such corrections, nor any new and quite different system, affect 

 this fact, so long as such systems are based upon observations of the rectal 

 temperature. Now the importance of this point is this, that the curve of 

 heat-production is seen gradually rising towards a maximum. Thus although 

 mechanical work was being performed at a uniform rate throughout each 

 experiment, and, therefore, at an average uniform rate throughout the whole 

 series of experiments, it would appear that the " heat-production " or total 

 amount of energy transformed which was associated with its performance 

 was not uniform, but that it increased during the progress of work 

 performance. There is, however, no confirmative evidence as to any 

 state of affairs like this obtainable from investigations of the primary 



