I came to a resolution to devote six hours a day to this pursuit for ten years. Instead of six hours daily for ten years, I believe I have, upon the average, applied myself to it for nearly ten hours daily for almost twenty years. In the first ten years of my search I may fairly say, I found nothing which I sought for; in the latter part of the twenty, the quantity of matter has so crowded in upon me, that I scarcely know how to dispose of it.