supp:rcoolinc and freezing— an njrs, lovelock Axn smith 145 



Dr. And jus: If nou enclose a rat in a jar ot' a certain capacity and allow the ex- 

 pired C( )._. lo accumulate, the animal cools down helow 20° of hody temi)erature 

 and surxives for two hours in the closed vessel. If the expired CO^ is heing ahsorhed 

 all the time, you i\\u\ that the aniiual, all other conditions hein*; identical, does not 

 cool to the same extent and dies alter a shorter period of confniement. 



Dr. Jean Henley: Do you get fihrillation of the heart? 



Dr. Andjus: I don't think so ; that is, we do not have any evidence of fibrillation. 



Dr. Smith: I think that occasionally hearts may fibrillate during rewarming. In 

 some of the rats which failed to revive fully, the heart was fihrillating at autopsy. 

 Sometimes when I had failed to revive a frozen hamster I found that the heart was 

 fihrillating when I opened the chest. We didn't record fibrillation in any of the 

 electrocardiograms. 



