This is a synthetic, integrated account of invertebrate nervous system knowledge, as of 1965. It is 1719 pages, with nearly 900 figures, more than 35 illustrations in color, and more than 100 fine-screen halftones, 16-page glossary, bibliographies, and indexes. This set of books has been together since it was new in 1965: a nice, vintage, original set of rare, science books in excellent condition.