Observations on reversionary payments, on schemes for providing annuities for widows, and for persons in old age, on the method of calculating the values of assurances on lives, and on the national debt

to which are added, four essays on different subjects in the doctrine of life annuities and political arithmetick : also, an appendix, containing a complete set of tables, particularly, four new tables, shewing the probabilities of life in London, Norwich, and Northampton, and the values of joint lives