Ssi^ec ^'"''"'' 



February 2, i924_ 



Nature 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME CXII 



JULY, 1923, to DECEMBER, 1923 



* " To the solid ground 



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





Unntrnn 



MACMILLAN AND CO., Limited 



NEW YORK : MACMILLAN COMPANY 



