RESPIRATION AND EXCRETION 305 



8. Hot baths, hot lemonade, or other hot drinks when the cold 



is just starting. Why ? Note. These avail little after the 

 disease is well started. It then becomes a struggle between 

 the body and the disease. 



9. In general, avoiding all drugs, except as prescribed by a 



physician. 

 10. Moderately exercising the muscles, because of the following 



normal physiological effects : 

 (a) Temporary relief of congestion. Why ? 

 (&) Better regulation of body temperature. Why ? 



(c) Greater physical and chemical changes in the body and 



lymph. 



(d) Freshening the lymph flow to the cells. 



(e) Keeping up the regular work of the heart. 



(/) Keeping up the depth and frequency of the respiratory 

 movements, and therefore better ventilation of the lungs. 

 (0) Increasing the activity of the digestive organs and glands. 



PROBLEM LIV, PART I (Experimental) 



To study some of the functions of the skin of man. 



Materials. Compound microscope, hand lens, ether or alco- 

 hol, large glass jar, and two thermometers. 



a. Experimental 



Method a. Touch the skin at several places with the point 

 of your pencil. 



Observations. 1. Do you find any place insensible to the 

 touch ? 



2. Are all parts equally sensitive ? 



Conclusion. What is one function of the skin ? 



Method b. Cool a large glass jar. Insert one hand in it, 

 and close the rest of the opening by wrapping the wrist with a 

 handkerchief or towel. Watch the inner surface of the jar 

 for a few minutes. 



Observation. Does anything collect on the inner surface 

 of the jar? 



SHARPE'S LAB. MAN. 20 



