i 3 a THE POPULAR SCIENCE MONTHLY 



tributed to the establishment of pharmacology and experimental pathol- 

 ogy. Medicine, in the sense of internal medicine, benefited by each and 

 every advance in each and every one of its contributary branches, and, 

 through the application of the principles of physics and chemistry to 

 methods of diagnosis, gained its present large equipment of instruments 

 of precision and means of exact interpretation ; surgery in like manner 

 gained the X-ray and many technical and mechanical procedures ; and 

 preventive medicine, utilizing the knowledge obtained through bacter- 

 iology, protozoology, immunity and chemistry, shares, with the science 

 of engineering, the glory of promoting in greater degree than all other 

 factors the social and industrial welfare of humanity. 



The facilities and opportunities possessed by American universities 

 for the continuance of this progress will be the subject of the fifth 

 lecture. 



