vi ADVERTISEMENTS. 
Increase of Ber mig Staff and List of Writers, New Type 
BETTER THAN EVER BEFORE. £ Paper. Progress in Every Ponsa 
FHE Sse kt R. 
A medium of interchange of observations for all student d l f nature. Devoted to all departments 
of nature studies 
Original, an Don’t fail to try it for 1891. 
E. F. BIGELOW, Editor and Publisher. Only ipepo cents a yea ug r E 
ASSOCIATE EDITORS “ Keep arb pci “open * (to observe the wonders 
and beauties of the out- ue world) is the motto of 
M. A. Boorn, F. R. M.S. , Microscopy, Longmeadow, THE 
OHN ce 2a Orn nithology, P rtland, _ onn. e e D i hill d field h h 
1 AP SON, Entomology, Norwich, C 
Miss C. p peenaa SHEPARD, Bot EE a 
Ne 
oods ; a e you interested in birds, flowers, insects 
rocks, ete. ; or have you a microscope? > Then you will 
ew Britain, Conn. þe pleased with THE OBSERVER. 
Address, E. F. BIGELOW, Publisher. 
THE OBSERVER, No. 5 Waverly Ave., Portland, Conn. 
“THE SANITARIAN 
Is the best Sanitary publication in America” (Mississippi Valley Medical 
Monthly); “Easily maintains its superiority over all similar publications” 
(Medical World) ; and ‘‘ Has accomplished more good than all of the other 
Sanitary papers put together’? (Hydraulic and Sanitary Plumber).  ‘‘The 
Editor, Dr. A. N. BELL, is well known to the mercantile community for his 
co-operation with the merchants in quarantine reform, and to his profession as 
a leader in Sanitary Science ” (Mew York Journal of Commerce). 
96 PAGES TEXT MONTHLY; TWO VOLUMES YEARLY. 
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113A SECOND PLACE, BROOKLYN, N. tr 
F OR SALE. 
Twenty different specimens of fos- 
sil plants from the Dakota Group 
Cretaceous will be sent to any ad- 
dress on receipt of $2.50. 
Send stamp for plate illustrating the set 
and list of 100 specimens. 
CHAS. H. STERNBERG, 
P. O. Box 60, LAWRENCE, KANSAS. 
Betulites vestii, var. ovalis Lx. 
