/ 



Blood Concentration. 187 



table 1. 



Hot Baths. 



Dog Number 



3 



3 



3 



3 



4 



4 



6 





4 o°C. 



4i.5°C. 



4 i«C. 



4 o° C. 



40 0 C. 



4 o 0 C. 



40° C. 



Percentage of Blood Sclids. 





21.6 



21.5 



21.4 



22.2 



19.3 



17.5 



19.4 











21.6 



18.7 







" 15 '* M " 



21.2 



21.1 



20.3 







16.5 





" 25 









20.6 









" 30 



21.6i 





19.5 











" 40 " M M 











16.9 







" 1 hr. 45 mins. in bath 















18.8 



Out of bath (and cooled with blower,) 

 25-45 min 



22.2 





22.2 











TABLE II. 

 Cold Baths. 



Dog Number 



3 



3 



4 



82 



9 2 



9 2 





n° C. 



8°C. 



IO° C. 





... 





Percentage of Blood Solids. 





20.5 



19.6 



17.3 



20.3 



20.5 



20.4 



After 10 mins. in bath 





21.7 











" 15 " " " 



22.4 





18.8 









M 25 ' 





21.7 





22.3 







M 30 













21.0 



M 35 4 



22.5 













" 45 











21.5 





Out of bath, 20-40 mins 



20.8 



21.2 



19.3 



| 





It will be seen from the tables that normal dogs respond regu- 

 larly to a moderately high environmental temperature by hemo- 

 dilution and to a cold environment by hemo-concentration. 

 Roughly, the change usually approximates 2 per cent, of the total 

 blood weight, which means a 10 per cent, change in the fluid 

 content of the blood. 



The circulatory factor in regulation against overheating and 

 cooling consists not merely in transferring of blood respectively 

 to or from the body surface but also in actual shifting of water into 



1 Bath had cooled down to 37.5°. 



2 Under morphine and chloretone. Cold stimulus was ice-water sponge and 

 blower. 



