PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



Series B. Vol. 90, No. B 631, 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



Researches on Growth and Movement in Plants by Means of the High 

 Magnification Crescograph. By Sir JAGADIS CHUNDER BOSE, 

 assisted by GURUPRASANNA DAS, L.M.S 364 



Investigations dealing with the State of Aggregation. Part IV. — The 

 Flocculation of Colloids by Salts containing Univalent Organic Ions. By 

 S. B. SCHRYVER. D.Sc, and NITA E. SPEER 400 



PRINTED AND PUBLISHED FOR THE ROYAL SOCIETY BY 

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

 Price Three Shillings and Sixpence. 



No. B 631. 



February 17, 1919. 



