1894. Third Edition. 187 pages. No dust jacket. Blue cloth boards with black lettering to spine and front. Black and white diagrams throughout. Pages are moderately tanned with noticeable foxing throughout. Cracks to front hinge, exposing netting. Slight crinkling to paper at gutters, however binding remains firm. front free endpaper removed. Pencil inscription to front pastedown and half title page. Thumb-marking present throughout. Boards have noticeable edge wear with slight rubbing to surfaces. Visible tanning to spine and edges with some crushing to spine ends. Noticeable black marks overall. Book has a slight forward lean.