UPrEK LIMIT OF TEMrERATURE. 



209 



were completely narcotised, and remained perfectly motionless, 

 the thermometer remained undisplaced in the rectum from the 

 beginning to the end of the experiments. 



The results are shown in the following table : — 



From this table it will be seen that the heart beats more 

 quickly as the temperature of the animal rises, till it reaches 

 its maximum, and then becomes slower, and finally stops. The 

 increase in the number of beats is not tlie same for each degree 

 of rise in the temperature, and the number of beats at the same 

 temperature, and also the amount of quickenirig for each degree 

 of rise of temperature, differs in the different animals. 



The upper limit of which the heart stands still varies in 

 different animals, but in the stronger animals it is between 

 113° and 114° F., or even above it. It must be remembered, 

 however, that this was the temperature of the rectum, and as 

 the back of the animal lay on the warm cotton wool covering 

 the tin vessel, and its belly was covered with cotton wool as 

 well, while the thorax was not covered, so as not to interfere 



