THE ROYAL SOCIETY. 



PROCEEDINGS 



OF 



Series B. Vol. 93. 



No. B 649. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



Address of the President, Prof. C. S. SHERRINGTON, at the Anniversary 



Meeting, November 30, 1 92 1 i 



On the Optical Rotatory Power of Crystalline Ovalbumin and Serum 



Albumin. By E. G. YOUNG, Ramsay Memorial Fellow . . . 15 



Experiments on Amphibian Metamorphosis and Pigment Responses in 

 Relation to Internal Secretions. By J. S. HUXLEY (New College, 

 Oxford), and L. T. HOGBEN (Imperial College of Science, London) . 36 



Studies in Bacterial Variability. — On the Occurrence and Development of 

 Dys-agglutinable, Eu-agglutinable and Hyper-agglutinable Forms of 

 Certain Bacteria. (A Report to the Medical Research Council.) By 

 E. W.A.WALKER . . ..... . . . . 54 



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No. B 649. 



January 2, 1922. 



