Farther, he finds, that between an increase of engagements on the one hand, and the unavoidable effects of advancing years on the other, he can expect but little leisure or ability for writing letters in future, except upon necessary business. By this method of sending to each of his correspondents many letters at once, he takes leave of them with the less regret, persuaded that he thus communicates the substance of all he could offer, if he was able to write to them severally as often and as much at large as in times past.