Anyone who buys these volumes will not regret it, for they are excellent value for the money. They contain a complete review of the main developments of the twentieth century written by a galaxy of distinguished personalities, from Ludendorff to H. G. Wells. The first volume is mainly taken up with political and economic essays, and the second deals more with developments in other spheres—science, art, medicine, etc. There is a section of thirteen pages on psycho-analysis, and the editors have been intelligent enough to realise that the proper person to write this was Professor Freud himself. It gives, as might be expected, a pithy account of the developments of his doctrines and the gradual spread of them.