PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
EOYAL SOCIETY OE LONDON. 
Series A. 
CONTAINING PAPEES OF A MATHEMATICAL OE PHYSICAL CHAEACTEE. 
VOL. 197. 
LONDON: 
FEINTED BY HAERISON AND SONS, ST. MARTIN’s LANE, W.C.. 
printers ht 6rbinarg lo '§is Hlajtsfg. 
December, IDOL 
