80 LABORATORY EXERCISES. 



41. TEMPERATURE OF THE BODY. 



A. Place the bulb of a chemical thermometer be- 



neath the tongue, closing the lips over it. 



1. To what point does the mercury rise? 



2. Is the temperature which you have deter- 



mined the same as that found by the 

 other pupils ? 



3. Take your body temperature on a cold day, 



then on a warm day; do you notice any 

 difference ? 



4. Determine whether the body temperature 



is the same after violent exercise as it is 

 before. 



B. Production of heat. 



1 . How was heat produced in experiment \ ? 



2. How is heat produced in your body? 



3. Is light produced in the human body (as in 



42. STUDY OF THE SKIN. 



Materials: Clean needle; printer's or mimeograph ink. 



A. Epidermis. 



i . Wash the hands thoroughly in warm water, 

 then dry them; rub together the palms 

 and fingers of both hands briskly for a 

 moment. What do you see on your 

 hands as the result? (This material was 

 a part of your non-living epidermis.) 



