OTHEK TYPES OF WATER INCREMENT 



51 



TABLE 2 



Urinary water losses of dogs, in the first 2.0 hours after giving water ty stomach plus 

 administering narcotic or anesthetic 



presuppose that water balance is restored or maintained during 

 anesthesia. Actually, no method has been devised of demonstrat- 

 ing whether an animal that is in water balance before anesthesia 

 continues to be so under anesthesia. Therefore all such tests rest 

 on the supposition that anesthesia has not shifted the relation 

 between water content and water balance. 



7 



I E 3 4 5 6 



Hours 

 Fig. 30. Course of sensible water load (% of Bo), i.e., forced intake minus nrinarj 

 output. Dog. Water given by rectum (A), mean of 5 tests on one individual; data of 

 Falck (1873). Water given by vein (B, C, and D) during 0.2 hour; data of Faick 

 (1872). At 1, half the load is returned in urine. 



