PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
ROYAL SOCIETY 
OF 
LONDON. 
(A.) 
FOE THE YEAE MDCCCXCII. 
VOL. 183. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN'S LANE, W.C., 
printers in (Drbhtarg to f)a ^lajestjr. 
MDCCCXCIII, 
