PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
R 0 Y A L S 0 C I E T Y 
OF 
LONDON. 
FOR THE YEAR MDCCCLXXI. 
VOL. 161 .— PART I. 
LONDON: 
PRINTED BY TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. 
MDCCCLXXI. 
