Theory of interest, [electronic resource] : simple and compound, derived from first principles, and applied to annuities of all descriptions. Containing, Arithmetical and Geometrical Progressions. Simple and Compound Interest, with Tables. Annuities at Simple and Compound Interest, with Tables. Of a Sinking Fund to extinguish the National Debt. The Value of a Perpetuity. Annuitics on Lives, with Tables. M. De Moivre's Hypothesis of Equal Decrements, with 22 Problems, shewing the Value of Life in all its Varieties. Insurance on Lives. Of the Expectation of Life. Of the British State Lottery. Of Tontines, and Insurance from Fire, &c. With an illustration of the widows scheme in the Church of Scotland. By the Reverend Mr. David Wilkie, Minister Of Cults.