The various contributors to this roundup of information on man in space all agree that man is the weakest and yet most necessary factor in the theories and calculations. That explains the deep thinking given over to him--as much (or more) as is given over to his machines of transportation and paths of travel. The articles here discuss Man in every possible aspect: his health, morale, motivation, weightlessness, biology, et al. The contributors are all authorities and the writing is all highly technical. Not for the lay reader, but for those equipped in language and background, it offers a comprehensive estimation of what man will be like when traveling at last in space.