92 



PHYSIOLOGICAL EEGULATIONS 



+• 

 a 



% 



3o 



o 



+1 



+2 *3 +4 



Mean Sensible Wa'ter Load 



Fig. 52. Eate of urinary water output (% of Bo/hour) in relation to mean sensible 

 water load (% of Bq). Each point represents the total urine put out in one hour in a 

 single test of figure 49. Two subjects are distinguished by triangles (K) and circles 

 (N). For each test a single ingestion of water occurred at zero time. 



the organism can do in recovering from a single ingestion of water 

 if given time to get under way and if given an optimal load. 

 Values of 1/At may, of course, be of largest magnitude when values 

 of SW/At are not maximal. 



The sort of data discussed above is confirmed in a less sys- 

 tematic way by early studies of Falck (1852), Ferber (1860), and 

 many others. Those studies differed mainly in furnishing mea- 

 surements only at 1-hourly intervals, in not relating exchanges to 

 body weight, in employing only one subject, and in measuring 

 urinary output but not total output of water. Falck demonstrated 

 that the time relations of the compensatory urinary output differed 

 but little when water was administered by rectum instead of by 

 mouth. 



O 



QC 



Sensible Wa+er Load 



Fig. 53. Eate of urinary water output in relation to sensible water load after single 

 ingestion of water. The same tests are averaged as in figures 49 and 50. 



