Dr. Finlay, in the twenty years before we went to Havana, had done a great deal of experimenting on the human subject with regard to yellow fever. But he had not been successful in transmitting the disease. He had no means of knowing that it took the mosquito twelve days from the time when she swallowed the blood of a yellow-fever patient to become herself infectious. Not knowing this fact, it was perfectly natural for Dr. Finlay to use his mosquitoes upon his experimental cases within the first four or five days after they had bitten a yellow-fever patient. At any rate, in a large number of experimental bitings of the human subject he did not have a single case in which the evidence was conclusive that yellow fever had been conveyed by the mosquito. Reed says of Finlay: “To Dr. Carlos Finlay, of Havana, must be given, however, full credit for the theory of the propagation of yellow fever by means of the mosquito, which he proposed in a paper read before the Royal Academy in that city at its session on the 14th day of August, 1881.” The Reed Board, after many months of inconclusive work in other directions, turned their attention to Dr. Finlay’s mosquito theory. Dr. Reed discussed the matter with Dr. Finlay a good deal before he commenced his mosquito work, and was thoroughly familiar with Dr. Finlay’s arguments and ideas on the subject. Indeed, we all knew Dr. Finlay well, but were rather inclined to make light of his ideas, and none more so than I. He and I met every day on the yellow-fever Commission above referred to, and it is probable that every day for more than a year we had more or less discussion on this subject. Dr. Finlay is a most lovable man in character and personality, and no one could be constantly thrown with him as I was daily for several years without becoming warmly attached to him and forming the highest estimate of his scientific honesty and straightforwardness. Being very familiar with yellow fever, both historically and clinically, I was constantly bringing to his notice instances in the past which could not be accounted for on the mosquito theory. He, with the greatest ingenuity, was equally ready to explain how the mosquito theory could be turned so as to meet just this condition. Dr. Finlay is still living in retirement and comfortable old age in the city of Havana. When the American forces were withdrawn from Cuba in 1902, Dr. Finlay succeeded me as health officer under the Cuban Government. He has since been retired on a pension by that Government. I called on him in Havana several years ago, and found him enjoying his more than eighty years of age, and the honors that were being heaped upon him. He is one of the few great men who has had his work recognized during his lifetime.