THE GUIDE TO NATURE— ADVERTISEMENTS 
XVII 
trade. tb** 
(rayolA 
An Artists' Drawing Crayon 
The box pictured contains 
24 crayons of the very best 
quality. For artists and 
Students of 
Nature, to be 
used for 
sketching and 
general color 
work. 
“Crayola” is 
put up in all de- 
sirable styles 
of packing, 6 
to 24 colors in 
a box. 
Color chart 1 and 
catalog on request. 
Dagor F : 6.8 
the universal lens 
Dogmar F :4.5 
the ultimate 
High speed lens 
'■pill-, same care and precision in 
J- manufacture that have made 
the name “Goerz” the synonym for 
highest grade in lenses has made 
Goerz Cameras second to none. 
The Goerz “Dagor” Lens is the 
universal lens for photographic 
purposes. The “Dogmar” is the 
ultimate high speed lens, free from 
coma and flare. 
Goerz cameras are light, strong, 
rigid, and accurately constructed. 
High Speed 
Ango. 
Light, compact, accurate. 
3J4x4J4, 4x5, 10x15 cm., 
5x7. 
Ask Your Dealer 
C. P. GOERZ AMERICAN OPTICAL CO. 
317G EAST 34TII STREET, NEW YORK CITY 
Distributors in the U. S. A. of Sendlinger Optical Glass 
Works, Berlin Manufacturers of Optical Glass of every 
description. 
BIRD-LORE 
A Bi-Monthly Magazine 
EDITED BY FRANK M. CHAPMAN 
500 Pages, 6 Colored Plates 
150 Photographs 
Price yearly, one dollar and a half. 
It will tell you how to study birds, how 
to form and conduct bird clubs, how to 
make nesting boxes, feeding stands and 
bird baths. You may consult its Advisory 
Council, take part in its bird censuses and, 
in short, become one of the great frater- 
nity who finds in birds ‘ the most elo- 
quent expression of nature’s beauty, joy 
and freedom.” 
We will be glad to mail you 
a specimen copy on request. 
D. APPLETON & CO. 
Harrisburg, Pennsylvania 
T lIE BRYOLOG1 ST — The only magazine in the Eng- 
lish language devoted wholly to articles dealing with 
Mosses, Hepatics, and Lichens. Of interest to be- 
ginners and advanced students alike. Bimonthly, pub- 
lished by the Sullivant Moss Society, an organization 
for mutual help in moss study. Special curators to 
assist beginners. Membership fee, $1.50 per year, in- 
cluding the Bryologist, subscription alone, $1.25; Cana- 
dian postage 10 cents extra. Address Edward B. Cham- 
berlain, 18 West 89tb Street, New York City. 
AQUATIC LIFE monthly magazine will 
~ increase your enjoyment 
of the life in nature’s streams and in your home 
aquarium. Written by scientists to entertain all 
nature lovers who like to paddle in water and 
-tudv it^ mnnv forms of life. A journal of popu- 
lar aquatic biology, not merely a fish fanciers’ mag 
azine. Specimen copy free on request. Subscrip- 
tion, $1.25 per year. Joseph E. Bausman, Pub- 
lisher, 542 East Girard Avenue, Philadelphia. 
THE 
AMERICAN MICROSCOPICAL SOCIETY 
(Founded in 1878) 
Publishes Its TRANSACTIONS as a 
Quarterly Journal of Microscopic Research. 
For information, write to 
P. S. WELCH, Secretary 
ANN ARBOR. MICHIGAN 
Best wishes for your further success 
with this bright entertaining and most 
instructive paper. — John M. Sheridan, 
Brooklyn, New York. 
