PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



Series B. Vol. 90. 



No. B 623. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



Observations and Experiments on the Susceptibility and Immunity of Rats 

 towards Jensen's Rat Sarcoma. By J. C. MOTTRAM, M.B. (Lond ), and 

 SIDNEY RUSS, D.Sc (Lond.), Cancer Research Laboratories, Middlesex 



The Germicidal Action of Ultra- Violet Radiation, and its Correlation with 

 Selective Absorption. By C. H. BROWNING. M.D.. D.P.H., Director of 

 the Bland-Sutton Institute of Pathology, Middlesex Hospital, and 

 SIDNEY RUSS, D.Sc, Physicist to the Middlesex Hospital. (Plate 3) . 33 



The Isolation from Peat of Certain Nucleic Acid Derivatives. By 

 W. B. BOTTOMLEY, M.A., Professor of Botany, University of London, 

 King's College ........... 39 



Obituary Notices of Fellows deceased : — Sir William Henry Power ; 



Clement Reid (with portrait) ........ » — x 



Hospital. (Plates I and 2) 



\ 



PRINTED FOR THE ROYAL SOCIETY and sold by 



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

 Price Three Shillings and Sixpence. 



No. B 633. 



October 1, 1917. 



