J^s^v^ 



Nature 



// 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME XC 



SEPTEMBER. 1912, to FEBRUARY, 1913 



" To the solid ground 

 Of Nature trusts the ?nind which builds for (jj'^."— Wordsworth 



ZZA-qiiT, 



MACMILLAN AND CO., Limited 

 NEW YORK : THE MACMILLAN COMPANY 



