This box of material consists of papers (notes, quotations, references, ideas) found inside books in Darlington's study at home. They were extracted by his stepson and executor, P.D.A. Harvey, who has added to each the name of the author, title and, usually, date of printing. Professor Harvey points out in his explanatory note (included in MS. Darlington c. 34/D.182) that some of the papers were used as bookmarks only; even so, most appear to be related to the book in question either directly or by reminiscence of similar ideas. The papers, which are very numerous, are some measure of the extent of Darlington's reading, bearing in mind that they relate only to his personal library and do not include the wide range of books reviewed for Heredity or the annotated scientific papers found widely elsewhere in the collection.