r-juiiilcii ;.v Kich.aU A. V!.,^u.r. 



With which is incorporated Hardwicke's Science Gossip), and the Ilhistrated Scientific Xe\v5 



A Monthlv Record of Science. 



CONDITTF.II BY 



Wilfred Mark Webb, F.L.S., and E. S. Grew, M.A 



Let Knowledge grow troni more to more." 



-Teiiiiysoii. 



X'ulume XXXIV. 



New Series, \"ohnne \'in. 



1911. 



London : 



Knowledge Publishing Company, Limited, 

 -4i. Bloonisburx' Square, W.C. 



