For the fourth edition of this great work, the author revised and brought up to date the text, notes and bibliographies. The design has been dramatically transformed, with all the illustrations now appearing in a single sequence integrated with the narrative text. Many new photographs have been obtained, and duotone printing has been used to achieve the highest possible quality of reproduction. This classic work is now reissued in a paperback edition, at a price that will make it available to students and a wider public.