236 Life and Health 



The honors of the great schools, academies, and colleges 

 are very largely taken by the abstainers from tobacco. This 

 is proved by the result of repeated and extensive compari- 

 sons of the advanced classes in a great number of institu- 

 tions in this country and in Europe. Our military and 

 naval academies and very many seminaries and colleges 

 very properly prohibit the use of tobacco by their "students. 

 The laws of many states rigidly forbid the sale of tobacco, 

 especially of cigarettes, to minors. \ L 



ADDITIONAL EXPERIMENTS 



Experiment 98. To illustrate the cooperation of certain parts of 

 the body. Tickle the inside of the nose with a feather. This does 

 not interfere with the muscles of breathing, but by reflex action they 

 'come to the help of the irritated part and provoke sneezing to clear 

 and protect the nose. 



Experiment 99. Pretend to aim a blow at a person's eye. Even 

 if he is warned beforehand, the lids will close in spite of his effort to 

 prevent them. 



Experiment 100. To illustrate how sensations are referred to the 

 ends of the nerves. Strike the elbow end of the ulna, where the 

 ulnar nerve is exposed, against anything hard (commonly called 

 " hitting the crazy bone "), and the little finger and the ring finger 

 will tingle and become numb. 



Experiment 101. To show that every nerve is independent of any 

 other. Press two fingers closely together. Let the point of the finest 

 needle be carried ever so lightly across from one finger to another, 

 and we can easily tell just when the needle leaves one finger and 

 touches the other. 



Experiment 102. To paralyze a nerve temporarily. Throw one 

 arm over the sharp edge of a chair back, bringing the inner edge of 

 the biceps directly over the edge of the chair. Press deep and hard 

 for a few minutes. The deep pressure on the nerve of the arm will 

 put the arm "asleep," causing numbness and tingling. The leg and 

 foot often fall " asleep " by deep pressure on the nerves of the thigh. 



