NATU 





l-H 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME XXIII. 



NOVEMBER 1880 to APRIL 1881 



" To the solid ground 

 Of Nature tnisti the mind wliich builds Jor aye." — WoRDS\V("im H 



Conbon anb ^tixi |)orh: 

 M A C M I L L A N AND CO. 



