r 



Supplement to Nature r\ 

 June 2, 189:! J 



Nature 



,4 



K' 



A WEEKLY U >^ ! 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME XLV 



NOVEMBER 1891 to APRIL 1892 



5055C8 



I6^ 5. -So 



" To the solid ground 

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



CO. 

 [892 • 



MACMILLAN A N D C O. ] 



