392 



PHYSIOLOGICAL KEGULATIONS 



That plan makes evident the relative time scales in which recov- 

 eries operate. Sometimes it is possible to limit comparisons to 

 the shapes of tolerance curves, leaving the loads in whatever arbi- 

 trary units are convenient for covering the range of known data. 

 Recovery depends upon net exchange, for no amount of increased 

 intake would overcome equally augmented output. Increments 

 of some components are disposed of with great haste (oxygen, 



*\00t 



■^50 



+25 



-50 



-100 



01 OA 0.6 



Hour3 



Fig. 183. Relative load in relation to time for nine diverse components. Man. 



Bromide, data of Hale and Fishman ('08). Iodide, data of Anten ('02). Water, from 



figure 51 (A) and figure 56 (P). Heat, from figure 143. Lactic acid in blood, from 



figure 173. Heart frequency, same data as are represented in figure 176. Carbon dioxide, 



approximate data of Adolph et al. ('29); and of Liljestrand ('16), cf. figure 171. 



Oxygen, from figure 176. Skin healing, data of Carrel and Hartmann ('16), cf. figure 



179. 



carbon dioxide), others almost not at all (fat, calcium, lead). 

 Correspondingly the content of carbon dioxide is exceedingly uni- 

 form, that of fat not. Hence adjustments of diverse components 

 are to be classed according as the responses to loads, expressed 

 perhaps as velocity quotients (tables 42 and 40), are fast or slow. 

 Lists of such quotients give the order in which recoveries appear 



