MORGAN, William (1750-1833). On the probabilities of survivorships between two persons of any given ages, and the method of determining the values of reversions depending on those survivorships, [London: 1788 or later]. [Bound with the same author's:] On the Method of determining, from the real probabilities of life, the value of a contingent reversion in which three lives are involved in the survivorship. [London: 1789 or later]. 2 offprints from the Philosophical Transactions, 4° (275 x 213mm), fly-titles, bound together in 19th-century half calf with red morocco label on front cover (rebacked, new endpapers). PRESENTATION COPY, front blank inscribed 'From the author.' The two papers were read before the Royal Society on 8 May, 1788, and 29 January, 1789.