No book for the beginner, but rewarding reading for those with sufficient groundwork in science. For this is science writing that hits the spot -- clear, logical, unsensational yet absorbing, with a strong sense of the subject's mind and personality emerging through a study of the problems he faced. Dr. Einstein, in the foreword, sings the author's praises. And in only 114 pages there is sketched the evolution of physical concepts from Newton and Galileo right down to the quandary of indeterminism that faces physics today. Almost a must for the true follower of science.