With Henry Ambrose Smith and William Orchard, Gray published ‘Assurance and Annuity Tables, according to the Carlisle Rate of Mortality, at three per cent.,’ 8vo, London, 1851, and contributed a preliminary notice to William Orchard's ‘Single and Annual Assurance Premiums for every value of Annuity,’ 8vo, London, 1856. His separate writings are: 1. ‘Tables and Formulæ for the Computation of Life Contingencies; with copious Examples of Annuity, Assurance, and Friendly Society Calculations,’ 8vo, London, 1849. 2. ‘Remarks on a Problem in Life Contingencies,’ 8vo, London, 1850. 3. ‘Tables for the Formation of Logarithms and Anti-Logarithms to twelve Places; with explanatory Introduction,’ 8vo, London, 1865; another edition, 8vo, London, 1876.
