<^ 



Suture 

 September 29 



I, 1921J 



Natum 



>' 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME CVII 



MARCH, 1921, to AUGUST, 1921 





" To the solid ground 

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



MACMILLAN AND CO., Limited 

 NEW YORK: THE MACMILLAN COMPANY 



