Nature, "| 

 February 10, 1923J 



Nature 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME CX 



JULY, 1922, to DECEMBER, 1922 



" To the solid ground 

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



,„»•)»" '"-•//,. 



FEB 20 1923 * 



il'onbon 



MACMILLAN AND CO., Limited 



NEW YORK: MACMILLAN COMPANY 



