PHILOSOPHICAL 
R A N S A C T I 0 N 
OF THE 
ROYAL SOCIETY 
OF 
LONDON. 
FOR THE YEAR MDCCCLXXXIII. 
VOL. 174.—PART IIP 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’S LANE, W.C., 
printers in Orbinarg to fUr glajestg. 
MDCCCLXXX1V. 
