150 PHYSIOLOGICAL EEGULATIONS 



genus of crab (Nagel, '34), one kind of annelid worm, and 4 genera 

 of protozoa (fig. 93; Miiller, '36). Perhaps a few more species 

 could with further search of published reports be added to that list. 

 I, too, have a sort of faith that all species, and especially those with 

 turnovers, put out water faster when the body has a water excess. 

 That inference is useful, but is not demonstration. 



Sometimes ''water drinking" is considered to be limited to 

 mammals, birds and reptiles. Though paths may be anatomically 

 different, greatly augmented rates of water gain are found in all 

 species of other classes and phyla in which intakes have been ob- 

 served during recoveries from water deficits. There is nothing to 

 compel physiologists to restrict the study of compensations by 

 water intake to those animals that have a particular anatomical 

 equipment. Eather, the evidence is that animals of all sorts ac- 

 celerate their intakes in every deficit, and none trust solely to sup- 

 pression of output. 



