Statistics for occurrence #1 of “Dr. Drake” in chapter 7 of William H. Herndon, Jesse William Weik, Herndon's Lincoln: The True Story of a Great Life, Etiam in minimis major, The History and Personal Recollections of Abraham Lincoln by William H. Herndon, for twenty years his friend and Jesse William Weik:

...melancholy became more intense than ever. In fact a tinge of this desperate feeling of sadness followed him to Springfield. He himself was somewhat superstitious about it, and in 1840-41 wrote to Dr. Drake , a celebrated physician in Cincinnati, describing his mental condition in a long letter. Dr. Drake responded, saying substantially, I cannot prescribe in your case without a personal interview. ...
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