Abstract
Gray (1944) analysed the pattern of muscular activity in mammals, but there is practically no published experimental data which could be used to check this analysis. Elftman (1938, 1939a, b, c) working with man, and Manter (1938), working with the cat, developed various types of apparatus for recording the forces exerted on the ground, but Manter’s published results give adequate data for the calculation of patterns of muscular activity for a single stride only. Following similar work on the Amphibia (Barclay, 1946), an attempt was therefore made to record the forces exerted on the ground by various mammals and to obtain synchronous photographs of the limb positions with a view to calculating the activity in the main groups of limb muscles.

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