Xaiux, I 



Nature 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME LXXIV 



MAY to OCTOBER, 1906 



" To the solid ground 

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



MACMILLAN AND CO., Limited 



NEW YORK: THE MACMILLAN COMPANY 



l0V8:oS1 



