The historical material here presented was gathered for my classes at Fordham University School of Medicine during your term as president of the University. It seems only fitting then, that when put into more permanent form it should appear under the patronage of your name and tell of my cordial appreciation of more than a quarter of a century of valued friendship. "When we have thoroughly mastered contemporary science it is time to turn to past science; nothing fortifies the judgment more than this comparative study; impartiality of mind is developed thereby, the uncertainties of any system become manifest. The authority of facts is there confirmed,.