TO 



NATHAN SMITH DAVIS, M.D., LL.D., 



RECENTLY DECEASED DEAN EMERITUS OF THE NORTHWESTERN 

 UNIVERSITY MEDICAL SCHOOL, 



IN HUMBLE RECOGNITION OF THE STIMULUS WHICH HE GAVE TO 



EXPERIMENTAL MEDICINE IN AMERICA AND IN GRATEFUL 



REMEMBRANCE OF THE INSPIRATION RECEIVED FROM 



HIM THIS VOLUME IS RESPECTFULLY 



DEDICATED BY HIS PUPIL, 



THE AUTHOR. 



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