Nature, ~] 



November -2 f,, 1909J 



Nature 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME LXXXI 



JULY to OCTOBER, 1909 



" To the solid ground 

 Of Nature trusts the 7>iind which builds for aye." — Wordsworth 



ITonDon 



MACMILLAN AND CO., Limited 



NEW YORK: THE MACMILLAN COMPANY 



