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In a work intended for the biologist, Szent-Györgyi outlines his present theories on muscle with regard to composition and structure, chemical and physical mechanisms of contraction and relaxation, and effects of such factors as temperature, ions, drugs, and regulators. Cross striated body muscle, heart muscle, and uterine muscle are considered. According to the author, the book "is not offered as a comprehensive and objective review; it is the presentation of the problem, as I see it, after fourteen years' acquaintance with muscle." The material is well organized and presented, and the printing is excellent. There is no index, probably because of the ephemeral nature of such a theoretical work.
A 1953 study studied this question.