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Title of Davis's paper: "The size of bursa of Yabricius compared with the ossification of skull and maturity of gonads of some Brazilian birds". March 3, 1945 Dr. David 1. Davis, P. A. Sanitarian Typhus Control Unit, Health Department San Antonio, Texas Dear Dr. Davis: Your undertaking is interesting and important, but I fear too big to be handled so briefly. Without experimental controls, Is it possible to classify with accuracy into immature and mature, especially in small samples colleoted at random seasons? At least I think you should go into more detail on just how the classifications were made. I can't see that Table 1 has any validity. It ignores season, and the proportion of imatures, of course, vaties seasonally. Are you familiar with the concept of turnover? If not, the attached reprint might be of help. Table 2 might be interpreted in terms of turnover, but not knowing the life history, I can't do it. The samples are too small to be separately significant, and one can't add them without *adding apples and potatoes". In general, I just feel helpless in giving you any advice, because I know too little about the species, and too little about the methods of sampling and classification. I fear, though, that your materials are too meagre for so comprehensive a treatment. They undoubtedly could be treated some way, but I can't visualize the way. Bear in mind that I know no physiology. I would seek the advice of somebody who knows physiology and who has done such work before going to print: at Wisconsin Kirpatrick, Irven hass, Dr. R. K. Meyer, Hans P. Thomson would all be more competent than 1. All but Dr. Meyer are in Service, and he is so busy that I do not feel at liberty to refer your paper to him. I appreciate your consulting me, and I assure you I'd like to be more constructive if I knew how. Yours sincerely, Ald. Leopold Professor of Wildlife Management cc Meyer, Base Thomeson, Kirpatrick
PHONE MARQUETTE 4140 Izaak Walton League of America Milwaukee Chapter MURL DEU SING SECY. AND TREASURER SIB W. WISCONSIN AVE. MILWAUKEE, WISCONSIN OFFICERS EUGENE WENGERT PRESIDENT LAWRENCE A. HAUTZ VICE-PRES. MURL DEUSING " Z-1 SECY-TREAS. 0 DIRECTORS DR. E. B. KOHLSOORF DR. E. A. FLANCHER PAUL SCHOLZ CARL P. DIETZ CLARNCE UNGCollege of Agriculture CLARENCE JUNG HENRY STENZEL KEN E.EERS University of Wisconsin KEN E. BEERS HARRY NEWTON idison Y.isconsin SIDNEY R. HARTWELLT S dear Mr. Leopold: Enclosed find our check to cover your expenses on your last visit to us. Your report has been an enense heln to us. We are now going ahead. Our first job will be an investigation of the human factors in the New Berlin area. If organization of the area is possiile we will go ahead with t1e plan. In that case we will be callinrg upon you1 for help angan. 3incerely yours, hM 1,r l Deusin, e.rf-tarv "WE PLEDGE TO POSTERITY THE OUTDOORS OF OUR ANCESTRY"