THE GUIDE TO NATURE-ADVERTISEMENTS 
XV 
< TRADE. 
CrayolA 
An Artists 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. 
“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. 
A NEW ARRIVAL 
GOERZ ROLLFILM TENAX 
(2Va x 3Va in.) 
First shipment 
of this LATEST 
model of high 
grade Roll film 
Cameras just in. 
New pleasing 
design, light and 
compact. 
Novel construc- 
tional features for 
easy and accurate 
operation. 
Highest perfec- 
tion of lens and 
shutter equipment, 
offering the choice 
of three h i g h 
grade -Goers ana- 
stigmat lenses, 
Dtogmar F: 4.5 
Dagor F: 6.8 
Tenastigmat F.6.3 
Compur Shutter 
with speed range 
from 1 second to 
1/250 of a second, 
(J4 actual size.) time and bulb ex- 
posure. 
A smaller model, the GOERZ V. P. ROLL- 
FILM TENAX (I^x2j4 in.) of much the same 
design as the 2% x 3 x /\ in. size has been intro- 
duced on the American market some time ago and 
has met with the greatest favor among camera 
enthusiasts. 
Ask your dealer, he should carry Goers 
Cameras in stock. For further description write to 
C. P. Goerz American Optical Company 
317 G EAST 34TH STREET, NEW YORK CITY. 
Color Cards and Descriptive Literature re- 
lating to our Paint, Enamels, Stains, and Var- 
nishes will be gladly sent in response to in- 
quiries addressed to our Home Office 
T HE BRYOLOGIST — The only magazine in the Eag- 
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 organizatioa 
for mutual help in moss study. Special curator* te 
assist beginners. Membership fee, $1.50 per year, in- 
cluding the Bryoloeist; subscription alone, $1.25; Caaa- 
dian postage 10 cents extra. Address Edward B. Cham- 
berlain, 18 West 89th 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 
>tudy its many 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 
FULTON AND CLINTON STREETS 
Brooklyn New York 
P. S. WELCH, Secretary 
ANN ARBOR, MICHIGAN 
