UNIFORMITIES AND COMPARISONS AMONG COMPONENTS 



367 



State I is characterized by the mean content (Co) and by its 

 variability (oc). Descriptions of conditions that prevail enable the 

 measurements to be reproduced. 



+£ 



12 3 



Tinne O' ' ^ 



Fig. 180. Diagrammatic representation of physiological states (in load and in rate 

 of exchange) in relation to time. An agent impinges at time O and ceases to act at 

 time O'. Five periods, representing five physiological states are distinguished : I, control 

 or balanced; II, initiating or loading; III, stationary or loaded; IV, recovery; V, 

 second control or recovered or balanced or final. Eates given represent gains (G) and 

 losses (L) in positive loads ; in negative loads G and L would be interchanged. Vari- 

 abilities of load (ac) from the control mean (Co), and of rates (oR, oG, oL) from the 

 control means (Ro, Go, Lo) are indicated. Areas M = Nr:M' = N'' are each equal to 

 Cm, the majdmal or stationary load. Portions of this curve are observable in the actual 

 data of figures 21, 23, 143, 163, 164, 160, 176, 106, and others. 



State II is related to the initial and the stationary states, very 

 often being represented by an exponential curve connecting the 

 two. Its duration is sometimes longer when the stationary load is 

 greater. In some respects it represents the resultant of what the 



