PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



Series B. Vol. 93. No. B 650. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



The Titration Curve of Gelatine.— Report to the Medical Research Council. 

 By D. J. LLOYD, Biochemical Laboratory, Cambridge, and C. MAYES, 

 Physical Laboratory, Eton College . . . . . . 69 



The Haemolytic Action of Sodium Glycocholate. By E. PONDER . . 86 



The Mechanism of Ciliary Movement. By J. GRAY, M.A., Fellow of 



King's College, Cambridge, and Balfour Student, Cambridge University. 104 



The Mechanism of Ciliary Movement. II. — The Effect of Ions on the Cell 

 Membrane. By J. GRAY, M.A., Fellow of King's College, Cambridge, 

 and Balfour Student in the University of Cambridge . . . .122 



On the Hypertrophy of the Interstitial Cells in the Testicle of the Guinea- 

 Pig under different Experimental Conditions. By A. LIPSCHUTZ, M.D., ■ " 

 Professor of Physiology (in collaboration with B. OTTOW, M.D., 

 C. WAGNER, Sc.D., and F. BORMANN). (Plates I and 2) . .-132 



On the Irritability of the Fronds of Asplenium bulbiferum, with Special 

 Reference to Graviperception. By T. L. PRANKERD, B.Sc, F.L.S. 

 Lecturer in Botany, University College, Reading. (Plate 3) . . M3 



• FEB J 3 1922 



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No. B 650. 



February 1, 1922. 



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