PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
ROYAL SOCIETY 
OF 
LONDON, 
FOR THE YEAR MDOCCLXXXIL 
VOL. 173.-PART I. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’S LANE, W.C., 
|1rmters m ©rbkarg ler fur Utajrstij. 
MDCCCLXXXII. 
