The letter notifying the collector of Boston that Mr. Waterhouse should succeed Dr. Jarvis, though written last Saturday happens not to be yet in the Post office. Strong applications are made in behalf of Dr. Eustis who by last mail wrote that he would accept the office. On the score of politics, it is asserted that Dr. Waterhouse is decidedly a federalist, & that Eustis on the whole is better entitled to that mark of attention from Government than any other physician in that quarter. On the ground of fitness, it is said that Dr. Eustis in point of practice and scientific knowledge is without comparison superior, that having left practicing when he came to Congress & living only one mile and a half from the hospital he will attend personally & daily, whilst Dr. Waterhouse residing at Cambridge about 5 miles distance & being Professor there cannot give such punctual personal attendance. It is added that much responsibility attaches to the office both as relate to admission of patients & superintendence of stores; and that, on that ground also, greater confidence may be placed in Dr. Eustis. Upon the whole as I think that the appointment of Dr Waterhouse will, Eustis being candidate, give very general dissatisfaction to our friends in that quarter, I have concluded to keep the letter until you should have again considered the question. Respectfully Your obedt. Servt.