PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



Series B. Vol. 93. 



No. B 654. 



BIOLOGICAL SCIENCES 



CONTENTS. 



Page 



Active Hyperemia. By D. T. HARRIS (Beit Memorial Research Fellow) 384 



The Acidity of Muscle during Maintained Contraction. By H. E. ROAF . 406 



On the Heat Production and Oxidation Processes of the Echinoderm Egg 



during Fertilisation and Early Development. By C. SHEARER, F.R.S. . 410 



Further Observations on Cell-wall Structure as seen in Cotton Hairs. By 



W. L. BALLS, M.A., Sc. D. (Cantab), and H. A. HANCOCK. (Plate 10) . 426 



Observations on the Distribution of Fat-Soluble Vitamines in Marine 



Animals and Plants. By J. HJORT. D.Sc, For. Mem. R.S. . 44» 



PRINTED AND PUBLISHED FOR THE ROYAL SOCIETY BY 

 HARRISON & SONS. Ltd., 44—47, ST. MARTIN'S LANE. LONDON. W.C.2. 



Price Three Shillings. 



I 



No. B 654. 



June 1, 1922. 



