An Oak Spring Sylva is the first of a series of discursive catalogues describing selections of the rare books and other material in the Oak Spring Garden Library, a collection formed by Mrs. Paul Mellon. Each volume in the Oak Spring series will be a lovely and useful compendium for book collectors, librarians, and garden historians. This volume, which deals with books and manuscripts on trees, describes nearly fifty books, manuscripts, or drawings, from a tiny 1555 book on oaks to early nineteenth-century advice manuals on large-scale tree planting.