The source that Abraham Lincoln had been infected with syphilis is none other than Lincoln himself, according to his biographer, friend, and law partner, William Herndon. In a letter to his co-author, Herndon wrote:
"When I was in Greencastle in 1887, I said to you that Lincoln had, when a mere boy, the syphilis, and now let me explain the matter in full, which I have never done before. About the year 1835-36, Mr. Lincoln went to Beardstown and during a devilish passion had connection with a girl and caught the disease. Lincoln told me this and in a moment of folly I made note of it in my mind and afterwards I transferred it, as it were, to a little memorandum book which I loaned to Lamon, not, as I should have done, erasing that note. About the year 1836-37 Lincoln moved to Springfield and took up quarter with [Joshua] Speed; they became very intimate. At this time I suppose that the disease hung to him, and not wanting to trust our physicians, wrote a note to Doctor Drake."
Gore Vidal, nolu chan, and gaiety.
The merry troika.