1938. Second edition. 532 pages. No dust jacket. Blue cloth with gilt titles to spine. Includes various diagrams. Introduction by Frederick Gowland Hopkins. Publisher's adverts to rear. Pages have slight foxing, tanning and minor thumbing. Pencil inscriptions to front endpaper and pastedown. Foxing more noticeable towards the start and end of the book. Boards have some moderate edge wear, with slight bumping to corners and minor bumping to spine ends. Boards a little rubbed and marked overall. Gilt is bright.