I have recd. Sir, your letter of Aug. 31st with the 2 Copies of your "Elements of Analytic Trigonometry." For the one to be retained by myself, I tender my thanks: The other will be disposed of as you request. Not pretending to be a competent judge, of the merit of the work, I can only express the confidence in it, derived from the high estimation in which your Scientific character has been held, and my best wishes that the task you have executed may be satisfactorily rewarded: to which, allow me to add assurances of my friendly respects