On the Heat Production Associated tvith Muscular Work. 315 



satisfactorily held for all the points but one. Thus the heat a man generates 

 by moving his limbs in a regular manner without doing external work is 

 equal to the difference between 4 - 5 times his weight and a constant. 



The one exception to the law was in the case of a boy weighing 437 kgrni. 

 who had no experience of cycling and whose earlier experiments were omitted 

 in consequence by Prof. Macdonald. 



20 



60 



40 



80 90 t_j lOO MO 120 130 MO 150 160 



rio 



Fig. 4. — Eelation between mass M and H (pedals turning ; no load). 



170 



If we now sum up the results, putting the values of H and A. from (3) 

 and (4) into our formula (2), we find 



H = -138 + 4-5M + - 



W 



0-08 + O003M* ( 0) 



The curves obtained from this formula for different values t>f W are given 

 in fig. 5, and the experimental results are there plotted. 



