INTERRELATIONS AMONG COMPONENTS 



401 



accumulates in the body, water leaves the body; this I represent 

 by plotting the heat load against the simultaneous water load (fig. 

 184, J). At the end of the period of walking, the man sits at rest 

 in a cooler atmosphere indoors ; recovery of heat content begins a 

 few minutes after the exercise and exposure to solar radiation 

 cease. Later, recovery of water content begins, for now the subject 

 drinks cold water as rapidly or as slowly as he desires it. In this 

 period both heat load and water load are diminished, so that the 

 initial or balanced state of the man is approached. 



Rate of Net Heat 

 Exchange 



To"tal Water Load 



Fig. 184. Heat load (Cal.Ag- of body weight) in relation to water load (% of Bo). 

 Man. The data are arranged to show the simultaneous courses of both loads (and of the 

 net rates of exchange, per hour, of heat and water) during loading and recovery. Ex- 

 posure in the desert conferred negative water load and positive heat load (two tests 

 on 1 subject are averaged) ; ingestion of ice water conferred positive water load and 

 negative heat load (3 tests on 3 subjects are averaged). In aU tests, recovery occurred 

 in air of about 31° C. Each point is the mean for a period lasting 0.37 hour. Further 

 data of Adolph ('38) and of Pinson and Adolph ('42). 



At every stage of the tests, the rates of net exchange both of 

 heat and of water are, of course, known. When those rates are 

 each related with the loads of the same component (fig. 184, M and 

 P), portions of two simultaneous equilibration diagrams are ob- 

 tained. Anyone may trace corresponding points on the two sepa- 

 rate curves by following various dash lines from one equilibration 

 curve to the other. In this manner the relations among four 



