17 ft PR 1886 
PHILOSOPHICAL 
TRANSACTION 
OF THE 
ROYAL SOCIETY 
OF 
LONDON. 
. '*' ***■ 
FOR THE YEAR MDCCCLXXXIV. 
.V, * 
VOL. 175.—PART II. 
LONDON: 
4 
# 
PRINTED BY HARRISON AND SONS, ST. MARTINS LAKE, W.C. 
^rinl£rs in (frbinarg to fjtr Pajestj. 
MDCCCLXXXV. 
