PROCEEDINGS 



ROYAL SOCIETY OF LONDON. 



i H 



From June 4, 1891, to February 25, 1892. 



VOL. L. 



LONDON : 

 HARRISON AND SONS, ST. MARTIN'S LANE, 



|)rinttrs in rbtnarg to Her Hfsjestjj. 



MDCCCXCIT. 



