96 DR. R. ANGUS SMITH PHYSIOLOGICAL EFFECTS OF 



After 45 minutes. 



Organic matter less sensible than at first to the majority. 

 D feels air to be bad. 



After 50 minutes. 



A can scarcely feel his pulse ; several attempts made to 

 count it. Still feels quite well. 

 B begins to fell head uneasy. 

 C feels his heart beat more than usual. 



D. Pulse weak. 



E. Pulse very weak. 



Here every one was observed to be sighing, although 

 all were cheerful. 



After 6 minutes. 



B, Flushed. 



C and D. Headache began slightly. 



The effect of company was considerable in preventing 

 the lowering of the pulse by keeping the mind cheerful. 



But the experiment, Table F, shows that even when quite 

 alone the pulse did not lower when the air was pure. 



This experiment differs from that of Table D. The im- 

 pure air was formed five times more rapidly, and the results 

 were not so perceptible. It would appear that we can resist 

 for a short time when we cannot resist for a long time. 



The irregularity of most of the pulses is apparent. 



A was the youngest, being about 17, and having a na- 

 turally low pulse ; his was raised. 



B was about 2 1 years old ; his pulse went lower, then 

 higher, then finally lower. 



C, about 24 ; his pulse went higher, then sank to nearly 

 its usual point, but he was the most afi'ected in sensation. 



D, 27; his pulse went higher and then lower. 



E, 47; his pulse went lower, higher, and lower, but he 

 felt no discomfort ; forehead began slightly to warm. 



