No Edition Stated. 87 pages. No dust jacket. Reddish brown cloth with gilt titles to front. From the Science Simplified series. Includes illustrations throughout. Pages have slight foxing, tanning and minor thumbing. Foxing more noticeable towards the start and end of the book. Previous owner's inscription to front endpaper and pastedown. Slight cracking to gutters, feeling a little shaken and uneven overall. Boards have some edge wear, with pronounced bumping and fraying to corners, while spine ends are crushed and frayed. Slightly scratched, rubbed and marked overall. Gilt is bright.