Yes, I agree with you. I think this yellow fever work will reflect great credit upon our corps. Certainly the work of proving the mosquito to be the transmitter of yellow fever is as important a piece of work as has been done since Jenner’s time, and as far as the United States is concerned, probably of more importance; and as yours was the guiding hand in the whole matter, I hope that some suitable reward will come to you, more substantial than the general professional recognition which you are now getting from all quarters. I am very happy to shine in the more humble rôle of being the first to put your discovery to extensive, practical application. Mrs. Gorgas joins me in kindest regards. Very sincerely yours, W. C. GORGAS, Major & Surgeon, U. S. A., Chief Sanitary Officer. (9) War Department, Surgeon General’s Office, Army Medical Museum and Library, Washington, Sept. 2, 1901. MY DEAR GORGAS: Upon returning to town, from a two weeks’ rest in the mountains, I find your very interesting letter of Aug. 26th. Of course, Carroll had already written to me about the unfortunate termination of some of Guiteras’ cases. I was very, very sorry to hear of Guiteras’ bad luck and can appreciate fully his mental distress over this loss of life. Perhaps, after all, the sacrifice of a few will lead to the more effectual protection of the many. I think that we had best look at the matter in this light. That eleven mosquitoes could and did infect _six_ persons, causing the death of three, is indeed, very strong confirmatory evidence of our observations of last fall and winter. I have been particularly anxious to learn of your results at Santiago de las Vegas, hoping to incorporate them in a paper on the prevention of yellow fever, which I hope to read at Buffalo; but since the good news comes that you will be there “in persona vera,” you can give the figures better than anyone else. I will, however, show by chart, the occurrence of yellow fever in Havana during the present year, and would be so glad if you would give me your cases and deaths for _August_. To Aug. 26th, you report only _two_ cases. Were there any others? I have the cases and deaths for the other months. Is not the record a _glorious_ one? But it would not have been obtained by a less energetic and enthusiastic Health Officer. You, therefore, my dear Gorgas, deserve all manner of praise for your thorough work. I hope that Carroll is meeting with success. Please let me hear from you by return mail, if possible, about your _August_ cases and deaths. A line will do. With kindest regards to Mrs. Gorgas, Sincerely, your friend, REED. (10) War Department, Surgeon General’s Office, Army Medical Museum and Library, Washington, October 3rd. MY DEAR GORGAS: