UNANF:STHETIZ1iD POIKIF^OTHERMIC DOG— KELLER 



TrrTT7-rrT7-r 



;DOG 527 



-24° C^ 



o 



45 

 44 

 4 3 

 4 2 



4 I 



HOURS 

 DAILY 12345678 



40 



UJ 



^ 39 



K 38 

 < 

 Q: 37 



UJ 



Q. 36 

 UJ 3 5 

 •-34 

 <33 



1^31 

 a: 



30 

 29 

 28 



27 

 26 



25 



DOG 527 



V.^_ ^^^DOG 112 

 C ^DOG 53 



DOG 28 



OUT TO 22°C 



-1_J l_J L_J L_L 



DAILY 012345678 

 HOURS 



4 5 

 44 

 43 

 42 

 4 I 

 40o 



o 



39 1AJ 

 q: 



38 3 



I- 



37< 

 tr 



36UJ 

 ol 



35 5 



UJ 



34h 



33-J 

 < 



32 I- 

 o 



31 UJ 

 oc 

 30 



29 



28 



27 



26 



25 



Fig. 3. — Cooling curves illustrating different types of reninantal cold combatting powers which 

 frequently escape the surgical attempt to reduce the animal to tlie completel}^ poikilothermic 

 status. See text for further reference. 



BASAL HEAT PRODUCTION* IN DOGS RENDERED POIKILO- 



THER^IIC IN VARYING DEGREES BY LARGE POSTERIOR 



HYPOTHALAMIC COAGULATIONS 



Basal heat production determinations calculated from oxygen consumption in 

 45 unoperated dogs, 36 dogs after they were inflicted with large posterior hypo- 

 thalamic coagulations and 6 litter mates before and after varying degrees of adeno- 

 hypophysectomy are plotted in figure 4. As shown by the lines drawn through the 

 scattered points for the unoperated dogs the average basal heat production for the 

 5-13 kg. weight range was 1.75 Calories per kilogram of dog per hour, for the 



* The author is indebted to Lt. Harold G. Danford for oxygen consumption determinations. 



