Lincoln replies to letter from Amos Williams of Danville, Illinois: "Herewith I send you a document of 'Information &c' which you can examine; and then if you think fit, to file a caveat, you can send me a description and drawing of your 'invention' or 'improvement' together with $20 in money, and I will file it for you."Abraham Lincoln to Amos Williams, 8 December 1848, CW, 2:14-15.