NATURE 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 





VOLUME XX. 



MAY 1879 to OCTOBER 1879 



J^ 



" To the solid ground 

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



I^onbon anb Jfff to ^ork : 

 M A C M I L L A N A xN D CO. 



1879 



