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A 590. Plane Stress and Plane Strain in Bipolar Co-ordinates. By G. B. Jeffery, M.A., D.Sc., Fellow 
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B 378. On the Structure and Affinities of Acmopyle Pancheri, Pilger. By Birbal Sahni, M.A., M.Sc., 
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B 379. On the Calcification of the Vertebral Centra in Sharks and Rays. By W. G. Ridewood, D.Sc. 
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B 380. The Life-History and Cytology of Synchytrmm Endobioticum (Schilb.), Perc., The Cause of 
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