PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 

 Series B. Vol. 90. No. B 626. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



The Germicidal Action of Ultra-violet Radiation and its Correlation with 

 Selective Absorption.— Addendum. By C. H. BROWNING, M.D., and 

 SIDNEY RUSS, D.Sc 107 



CROON IAN LECTURE —Evolution and Symmetry in the Order of 



the Sea-pens. By Prof. SYDNEY j. HICKSON, F.R.S. . . .108 



Bactericidal Properties Conferred on the Blood by Intravenous Injec- 

 tions of Diamino-Acridine Sulphate. By C. H. BROWNING and 

 R. GULBRANSEN . . . 136 



The Isolation and Serological Differentiation of Bacillus tetani. By 

 W. J. TULLOCH, M.D., Temp. Capt. R.A.M.C. (Lecturer on Bacteriology 

 at the University of St. Andrews) . . . . . . . '45 



Obituary Notices of Fellows deceased : — Hermann Graf zu Solms-Laubach 



(with portrait) ; Robert Bell xix — xxvii 



PRINTED FOR THE ROYAL SOCIETY and sold by 



HARRISON & SONS, 45. ST. MARTIN'S LANE, LONDON, W.C. 



Price Three Shillings. 



No. B 6a6. 



April 2, 1918. 



