/ 



Regulation Against Cold. 185 



regulation against cooling in a bath the temperature of which is 

 maintained for a half hour or more at 20 0 C. In two such dogs 

 there were net gains in body temperature as a result of exposure 

 to the bath (respectively o.i° C. and 0.4 0 C. in forty minutes). 

 In a third animal the temperature fell 1.5 0 C. during the first 

 twenty minutes but in the following thirty-five minutes showed a 

 gain of 0.8° C, thus showing that the regulation against cooling 

 was established after a delay. 



In these three normal experiments the increases in blood solids 

 were 1, 2.1 and 1.8 per cent, respectively. The following table 

 illustrates these points. In all of the experiments here reported 

 the room was kept at a standard temperature of 22 0 C. 



table 1. 



Effects of 20° C. Baths in Normal Dogs. 



Dog Number. 



Percentage Blood Solids. 



Rectal Temperature. °C. 















Before. 



After. 



Before. 



After 20 Min. 



After 40 Min. 



After 55 Min. 



48 



19.3 



20.3 



39.9 



40.1 



40.0 





23 



20.4 



22.6 



38.3 



38.4 



38.7 





27 



14.7 



16.5 



39.4 



37.9 



38.4 



38.7 



With the above should be contrasted the effects of similar 

 baths upon three dogs with transection of the cervical cord, as 

 shown in Table II. 



TABLE II. 



Effects of 20° C. Baths upon Dogs with Cervical Cord Section. 



Dog Number. 



Day 8 After 

 Operation. 



Percentage Blood Solids. 



Rectal Temperature, °C 



Before. 



After. 



Before. 



After 40 Min. 



211 



1 



19.5 



19.9 



34.5 



31.0 



42 



7 



18.1 



18.9 



36.5 



32.6 



27 



2 



17.3 



17.6 



37.5 



34.6 



The second table shows that dogs with cord section between 

 the sixth and seventh cervical segment are quite unable to with- 

 stand baths of 20 0 C, exhibiting a rapid fall in body temperature, 

 usually to a dangerous level within forty minutes. Unlike the 

 normal dogs they fail to exhibit shivering. As regards the con- 

 centration of the blood, all of these dogs exhibited an abnormally 

 low blood solid percentage as a result of the operation. 



1 Bath 17.5° C. 



