Career
He was appointed actuary to the Sun Assurance Society on 15 June 1810, and reconstructed the life tables then in use. He gave evidence before the select committee on the laws respecting friendly societies (1825 and 1827). By 1839 Milne had lost interest in the values of life contingencies, and turned to natural history.
He is said to have possessed one of the best botanical libraries in London.
He resigned his position in the Sun Office on 19 December 1843, and died at Upper Clapton on 4 January 1851.