Doubts re: Levin and Wyman paper on elasticity of muscle heavily referenced in proof of paper 'by the three men of Lourain' - especially relating to experimental technique. Discusses appropriate technique for such investigation. Relavence of Hooke's law to these studies, algebraic expression of adaption of Hooke's Law to the problem (including diagram), relative trustworthiness of method employed by Eccles and significance of establishing a 'real physiological constant of muscle'.