THE SKIN AND BODILY TEMPERATURE. 93 



II. VARIATIONS IN THE TEMPERATURE. 



Apparatus. A physician's thermometer. 



Take the temperature at different times, when very 

 warm and when cold. 



III. THE REGULATION OF THE TEMPERATURE. 



Material. Ether or alcohol. 



Pour a few drops of ether or alcohol on the hand. How 

 does it feel ? Why ? How do a dog and a cat cool off ? 

 How does a person ? 



