Nature 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME XXXIII 



NOVEMBER iSS-; to APRIL i{ 



" To the solid ground 

 Of Nature tiiisls tlie mind wliicli builds for aye." — Wordsworth 



ITonbon anb |l^hj |lork 

 MACMILLAN AND CO. 



1 886 



