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This latest volume of the proceedings of the Society for Experimental Stress Analysis begins with an interesting account by one of its promoters, Mr R. D. Mindlin, of the activities of the Society since its inception a few years ago. There follow a dozen papers which are well up to the high standard set by previous volumes. Four are devoted to the problem of repeated loading and fatigue, two to the description of instruments for telemetering flight data from the aeroplane to the ground; two papers describe instruments for the accurate measurement of small displacements; there is a paper on dynamic testing, another on accelerometers and lastly a paper on the measurement of stresses in moving parts.