WATER RELATIONS OF OTHER SPECIES 



123 



of water are present, (d) a similar recovery by faster gain when 

 deficits of water are present. The following pages show that these 

 possibilities are realized in a variety of animals, with the exception 

 that in some no turnover has been demonstrated. Also, a greater 

 variety of rates of exchange is uncovered than would thus far be 

 predicted. 



§ 42. Rabbit 



Water excesses introduced by stomach (fig. 72) give rise to 



diuresis in the rabbit (Lepus). If the data only of series C existed, 



it might be concluded that recovery from excess water is both slow 



and incomplete. In that series the diverse individuals and tests 



3 



3 



o 





Sensible Water Load 

 Fig. 72. Rates of urinary output (% of Bo/hour) in relation to sensible water 

 load (ingesta minus urine) (% of Bq) in rabbit. A, mean in intervals of 0.5 hour, data 

 of Heller and Smirk ( '32a, p. 18) ; B, mean in hourly intervals, 7 tests and individuals 

 of Abe ( '31b, p. 414) ; C, mean in hourly intervals, 32 tests on 11 individuals of God- 

 lowski ('30, pp. 87 to 92). Evidently conditions for prompt and unimpeded diuresis 

 do not prevail in series C. Standard errors are shoAvn by brackets at four points ; J. = 

 half of load returned as urine. 



are more consistent among themselves than in any other series, yet 

 in 4 hours less than half of the excess water is returned as urine. 

 Comparison with the rabbits of series A and B suggests that those 

 of series C were in water deficit before the new water was admin- 

 istered. 



In rabbit the acceleration of diuresis is about equal to that in 

 dog and man, for maximal rates of urinary output prevail in the 

 second hour after water is placed in the stomach. 



When the excesses are very large (AW + 30), rates of excre- 

 tion up to 5.4% of Bo/hour are found (data of Misawa, '27), but 



