PROCEEDINGS 



OF THE 



ROYAL SOCIETY OF LONDON 



Seeies B 



CONTAINING PAPEES OF A BIOLOGICAL CHAEACTEE 



VOL. XCII. 



LONDON: 



Printed for THE EOYAL SOCIETY and Sold by 

 HAREISON AND SONS, LTD., ST. MAETIN'S LANE, 

 printers in okdinarv to his majesty. 



December, 1921, 



