PROCEEDINGS 



OF THE 



ROYAL SOCIETY OF LONDON 



Series B 



CONTAINING PAPEES OF A BIOLOGICAL CHARACTEE 



LONDON: 



Printed for THE EOYAL SOCIETY and Sold by 

 HARRISON AND SONS, ST. MARTIN'S LANE, 

 printers in ordinary to his majesty, 



July, 1919. 



VOL. XC. 



