Chicago, April 28, 1901.
To the Editor:
—In The Journal of April 27 there appeared a letter by Dr. Corban E. Judd, relating to an article recently published by me in which I had formulated a theory in regard to acquired immunity. Dr. Judd states that Dr. O. P. Davis, of Topeka, Kan., had presented a paper before the Medical Science Club of Topeka, on Feb. 18, 1901, which, to use Dr. Judd's words, "embraced all that Dr. Class sets forth and more." As my paper was published April 13, 1901, a claim for priority is made in favor of Dr. Davis. Priority squabbles are usually not very edifying, and in this case of no particular moment; still, I would like to state my position. Dr. Judd states that Dr. Davis's theory embraced all that I set forth and more. Dr. Davis, by saying "more," made his theory different from