Long, John St. John (Dictionary of National Biography, 1885-1900, Vol. 34)

The original 1893 Dictionary of National Biography entry on John St John Long, by James McMullen Rigg, transcribed in full on Wikisource (public domain). Confirms his birth at Newcastle West, Co. Limerick, in 1798 as second son of basket-maker John Long and Anne St John; his early career as an unsuccessful portrait and still-life painter; his move to London in 1822 and adoption of 'corrosive liniments and friction' as a treatment for consumption and rheumatism from 1827; his Howland Street and then 41 Harley Street practice, where he was 'quite the medecin a la mode'; his manslaughter conviction on 23 October 1830 and £250 fine; his acquittal on a second manslaughter charge; his death of untreated consumption on 2 July 1834; and the bequest of his liniment 'secret' (valued at £10,000) to his brother William. Note: the DNB page's own header bracket misprints his death year as 1831 (an error in the 1893 original); the body text correctly gives 2 July 1834, corroborated independently by Wikipedia, Find A Grave, and Hempel's 2014 Lancet piece.