THE CL IDE TO NATURE— ADVERTISEMENTS 
XVII 
An Artis's' Drawing Crayon 
The box pictured contains 
24 crayons of the very best 
quality. 
Students 
For artists and 
of Nature, to be 
used for 
sketching and 
general color 
work. 
Dagor F: 6.8 
the universal lens 
Dogmar F:4.5 
the ultimate 
High speed lens 
W HY a Goerz? Because you 
want results. And a Goerz 
gets results, not orl/ because 
it is equipped with a Goerz lers, 
but because of its simple, sturdy 
construction and the extreme 
nicety of workmanship that as- 
sures every moving part working 
accurately, always. 
Goerz Cameras are made in sev- 
eral types and sizes to suit all 
needs. You have the choice of the 
Goerz “Dagor,” the universal lens 
or the Goerz “Dogmar,” the ulti- 
mate high speed lens, free from 
coma or flare. 
High Speed An go 
For experienced 
photographers: 
3 l A x 4*4 
4x5, 10 x 15 cm. 
5x7 
Ask your dealer to let you 
see A he different types of 
Goerjs- Cameras and the re- 
sults tihey produce. 
C. P. GOERZ AMERICAN OPTICAL CO. 
317G East 34th Street, New York City. 
Makers and importers of photographic, optical and 
scient ifi c i nst r u m e n ts . 
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 b'rds, 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.” 
He will be glad to mail you 
a specimen copy on request. 
D. APPLETON & CO. 
Harrisburg, Pennsylvania 
T ilE BRYOLOGJST — The only magazine in the EiJg 
lish language devoted wholly to articles dealing wufc 
Mosses, Hepatics, and Lichens. Of interest to Ik 
ginners and advanced students alike. Bimonthly, pufc 
lished by the Sullivant Moss Society, an organiz«uio» 
for mutual help in moss study. Special curators u 
assist beginners. Membership fee, $1.50 per year, »•» 
eluding the Bryoloeist, subscription alone, $1.25, Can 
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 
study its manv forms of life. A journal of popu- 
lar aquatic biology, not merely a fish fancier^’ mag 
azine. Specimen copy free on request. Subscrip- 
tion, $1.25 per vear. Joseph E. Bausman, Pub- 
lisher, 542 East Girard Avenue, Philadelphia. 
CAMERA CRAFT 
Claus Spreckels Bldg., San Francisco, Calif. 
Practical and informative for amateur, com- 
mercial and portrait photographers. 
Its advertising pages keep you up-to-date. 
To be enlarged Januarv 1st, 1922, and sub- 
scription price raised to $1.50. Up to that date 
we will accept subscriptions at 
$1.00 PER YEAR 
for one or more years. 
Canadian postage 25c Foreign postage 50c 
Sample on request. 
