New-York: William Radde, 1846. First American Edition. Letter first published in the "British Journal of Homœpathy," April, 1846. The author, a Scottish physician, was one of the earliest British practitioners of homeopathy, losing both his position at the Royal Infirmary and most of his practice, while also drawing criticism from not just Forbes, but many others. Interestingly, even Forbes' original article was itself deemed too sympathetic to homeopathy and his Review closed shortly after its publication, while the present article raised Henderson in the eyes of the public, if not the medical profession (DNB). Octavo (23cm.); removed, retaining original stitching; 66pp. Some light dust-soil and wear from handling, contemporary gift inscription at head of title page (serving as upper cover), else Very Good and sound.