 In Stahl's 1692 dissertation, "De motu tonico vitali," Stahl explains his theory of tonic motion and how it is connected to blood flow within a subject, without citing William Harvey's blood flow and circulation theories, which lacked an explanation of irregular blood flow.Also within the dissertation, 'practitioners' are mentioned as users of his theory of tonic motion.Stahl's theory of "tonic motion" was about the muscle tone of the circulatory system.