THE GUIDE TO NATURE— ADVERTISEMENTS 
XV 
TRADE. 
(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 charts and 
catalog on request. 
The Power 
Of Quality 
Quality is the reason for the unparal- 
leled success of the famous GOERZ 
DAGOR F/6.8 anastigmat. This lens 
has met the most exacting photographic 
requirements in every part of the world. 
Today it is unsurpassed by any lens in 
definition, covering power, brilliancy and 
quality. 
The popular GOERZ DOGMAR F/ 4.5 
convertible anast'gmat — three lenses in 
one — is enjoying phenomenal success be- 
cause of its speed, definition, brilliancy, 
convertibility and quality. 
Call at your dealer’s and talk it over with 
him or write to us for assistance in mak- 
ing a wise selection. GOERZ QUAL- 
ITY is a power in the photographic 
world. Get that “better lens” to-day. 
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 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 organizatioa 
for mutual help in moss study. Special curators to 
assist beginners. Membership fee, $1.50 per year, i«- 
cluding the Bryoloeist; subscription alone, $1.25; Cana- 
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 
study 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 
