I keep from thirty to forty large portfolios, in cabinets with labeled shelves, into which I can at once put a detached reference or memorandum. I have bought many books, and at their ends, I make an index of all the facts that concern my work; or, if the book is not my own, write out a separate abstract, and of such abstracts I have a large drawer full. Before beginning on any subject, I look to all the short indexes and make a general and classified index, and by taking the one or more proper portfolios I have all the information collected during my life ready to use.
CHARLES DARWIN (1809 - 1882), 1 Mat 1881, The Autobiography of Charles Darwin and Selected Letters, 2, ed. Francis Darwin, 1892.
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