Apri 



Nature^ ~] 

 V II, 191 1 J 



Nature 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME LXXXVIII 



NOVEMBER. 1911, to FEBRUARY, 1912 



" To the solid ground 

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



MACMILLAN AND CO., Limited 

 NEW YORK: THE MACMILLAN COMPANY 



