1935. First Edition. 156 pages. No dust jacket. This is an ex-Library book. Green cloth. Book II. Expected library inserts, stamps and inscriptions. From Dent's Modern Science series. Pages have slight foxing, tanning and minor thumbing. Pencil inscriptions to front endpaper. Foxing more noticeable towards the start and end of the book. Occasional ink spots throughout. A few dog-eared corners. Previous owner's inscription to rear pastedown. Boards have some moderate edge wear, with slight bumping to corners and minor bumping to spine ends. Boards rather rubbed and marked overall. Pronounced brown staining to rear. Spine is slightly sunned.