VOL. II. 



NO. 6. 



APRIL, 1896 



U^EU/H 





A Journal Devoted to Research in 

 Natural Science. 



A'.-} TES: — $i.on per year to all countries, in advance. Single numbers, 10 cts. 



Berlin Agency, R. Fkiedlandek & Sohn, Berlin, N. W, Carlstrasse 11. 

 London Agency, Swann & Co., 1 and 2 Bouverie St., Fleet St., London, England. 



Publlsbed the Flfteentb of Bach Month by 

 WALTER F. VVEBB, ALBION, N. Y. 



