Lincoln reads proof sheets of his Cooper Union address, makes changes, and returns them to Charles C. Nott. "And now please accept for yourself, and present to the 'Young men's Republican Union' my grateful acknowledgments, for your and their exceeding kindness towards me in this matter." He writes to A. K. McClure of Pennsylvania regarding danger in that state. Abraham Lincoln to Charles C. Nott, 6 September 1860, CW, 4:113; Abraham Lincoln to Alexander K. McClure, 6 September 1860, CW, 4:112-13.