Nature, ] 
December 14, 1899 
Nature 
A WEEKLY 
MIMSTRATED JOURNAL OF SCIENCE 
VOEUME LX 
MAY 1899 to OCTOBER 1899 
“To the solid ground 
Of Nature trusts the mind which builds for aye.’—WoORDSWORTH 
ARSON 
oS” v4, 
Re 
LIBRE 
Vondon 
NeA CiVinlvie AGN A N Deo} simrreD 
NEW YORK: THE MACMILLAN COMPANY 
