Unpublished manuscript, on medical electricity by John Birch Birch describes the application of electricity and electric shocks to treat certain diseases. Birch describes his contributions to and the design of an electric machine, as well as his system of practice developed from years of experiments with electricity. Birch uses his machine to relieve acute pain, stop spasms, revive paralysed muscles, and remove 'obstructions'. He then gives details from specific cases in which his electric therapies cured or relieved symptoms of patients at St Thomas' Hospital [London]. Subject: Medicine Written at Essex Street [London]. January 1787