June 14, 1900 J 



Nat u re 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME LXI 



NOVEMBER 1899 to APRIL 1900 



" To the solid ground 

 Of Nature trusts the mind which builds for aye." — Wordsworth 





MACMILLAN AND CO., Limited 

 NEW YORK: THE MACMILLAN COMPANY 



