430 ILLINOIS STATE ACADEMY OF SCIENCE 



spaces, which air could occupy under normal conditions, 

 or the lung may be rendered less elastic through in- 

 creased vascularity. 



In conclusion, it may be said that we have in the vital 

 capacity determination a test which is simple and easily 

 performed, and at the same time, gives important in- 

 formation concerning the functional condition of the 

 heart and the lungs. As an aid in diagnosis and prog- 

 nosis, and to indicate the efficacy of treatment, it merits, 

 I believe, the serious consideration of the medical world 

 of today. 



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