Chapter XVII 



INTERRELATIONS AMONG COMPONENTS 



§ 145. Up to this point I have studied each component as though 

 it were independent of others. Though an organism evidently has 

 many components under regulation, each could be examined sepa- 

 rately. Had that not been possible, but little progress in their 

 analysis would have been made by the correlation of so few vari- 

 ables as were actually recognized. 



The more closely a physiologist examines what is going on in 

 an animal, the more he realizes that any single component is not 

 receiving the organism's whole ''attention." To find mutual influ- 

 ences at work, he may measure adjustments of two or more com- 

 ponents that are simultaneously disturbed. No new materials 

 might be needed to show coincident recoveries among several 

 components, for some have already been presented in the form 

 of correlatives of water load (§ 80, § 85). There, a tendency pos- 

 sibly prevailed to regard water increment as an independent vari- 

 able and other components as dependent. A more explicit study 

 of several components upon an equal footing, and the exchanges 

 of each, may therefore serve to indicate what a bag of interrelations 

 the organism is. 



Data appropriate to the study of great numbers of simultaneous 

 properties and events are not difiicult to record, for tables may 

 fully represent them. The desire to visualize more and more 

 relations among them, however, drives me to explore additional 

 methods of representation. The same sort of urge that compels 

 an investigator to seek more data, here plunges him into a search 

 for multiple relations. 



§ 146. Heat load and water load in man 



Everyone knows that a quick way to get into negative water 

 load is to overheat. Similarly a convenient way to get into negative 

 heat load is to drink ice water. These two sorts of experimental 

 situation may be considered in detail. 



Transitions from heat balance to considerable positive heat 

 loads occur when a man walks for an hour in the hot desert 

 (Adolph, '38, p. 492). During walking (transitional state), as heat 



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