1970. Third Impression. 415 pages. Revised by Winifred Pennington. The Fontana New Naturalist. Pictorial paper cover. Contains black and white photographic plates. Pages are lightly tanned with mild foxing to endpapers and text block edges. Gutters are moderately cracked with binding exposed. Binding is slightly loose. Pencil inscription to half title page and reverse of front cover, with a few small nicks along text block edge. Cover has light shelf-wear to edges and surfaces, with slight curling to corners. Mild crushing to spine ends, with visible reading creases down spine.