1. Hadden MSS (Nottingham University Archives); P. Morgan, Annals of Woodside and Newhills (Aberdeen, 1886), pp. 68–9; A. F. Munro, Memorials . of Aberdeen (Aberdeen, 1897), pp. 260–2. I am indebted to Dr 1. Adams for information on the Aberdeen sources.
2. D. Landes, The Unbound Prometheus (Cambridge, 1969), p. 92.