THESE two books make an admirable supplement to the account of the Tennessee Valley Authority which Dr. Julian Huxley gave us last year. Their scope is sufficiently indicated by their sub-titles. In the first, Mr. David E. Lilienthal, chairman of the Tennessee Valley Authority, gives us from inside an interpretation of this great experiment in regional planning, as much from the point of view of its significance for the future as from that of narrating its technical and social achievements up to the present. This is the more popular of the two books. It is ably written and well documented, but endeavours to indicate the spirit rather than the technical detail of the achievements in the Tennessee Valley. Mr. Lilienthal is at pains to make plain the factors which have contributed to its success in the face of much strenuous opposition and misrepresentation.