The hurry in which I wrote my letter to Mr. Madison, which is in your hands, occasioned an inattention to the difference between generations succeeding each other at fixed epochs, and generations renewed daily and hourly. It is true that in the former case, the generation when at twenty-one years of age, may contract a debt for thirty-four yours, because a majority of them will live so long. But a generation consisting of all ages, and which legislates by all its members above the age of twenty-one years, cannot contract for so long a time, because their majority will be dead much sooner. Buffon gives us a table of twenty-three thousand nine hundred and ninety-four deaths, stating the ages at which they happened. To draw from these the result I have occasion for, I suppose a society in which twenty-three thousand nine hundred and ninety-four persons are born every year, and live to the age stated in Buffon’s table. Then, the following inferences may be drawn. Such a society will consist constantly of six hundred and seventeen thousand seven hundred and three persons, of all ages. Of those living at any one instant of time, one half will be dead in twenty-four years and eight months. In such a society, ten thousand six hundred and seventy-five will arrive every year at the age of twenty-one years complete. It will constantly have three hundred and forty-eight thousand four hundred and seventeen persons of all ages above twenty-one years, and the half of those of twenty-one years and upwards living at any one instant of time, will be dead in eighteen years and eight months, or say nineteen years. Then, the contracts, constitutions, and laws of every such society become void in nineteen years from their date. LETTER XIII.--TO GENERAL KNOX, September 12,1789 TO GENERAL KNOX. Paris, September 12,1789. Sir,