For those engaged in research on Darwin or his circle, the Darwin Library is an invaluable resource. Originally donated by Darwin's son Francis to the library of the Botany School and now deposited in Cambridge University Library, it contains handwritten scribbles on book pages, note-filled scraps of paper pinned to back covers and personal inscriptions from mentors such as J. S. Henslow. First published in 1908, this catalogue to the Darwin Library collection, with an introduction by Francis Darwin, provides a gateway into Darwin's thought, research and intellectual context via his personal books and pamphlets. The book lists works in English and other languages, and contains bibliographic information, including the original publisher and date of publication, together with details of translations.