THE GUIDE TO N ATU RE— ADVERTISEMENTS 
XV 
TRADE. 
CrayolA 
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. 
BINNEY & 
SMITH CO., 
81 Fulton St., 
New York. 
IF YOU COULD BUY 
An Octavo Book on Birds 
with 
Over 800 pages of texts, 12 colored 
plates and 150 photographs of birds 
from Nature, for $2.50, you would 
think you had a bargain. 
BIRD-LORE 
will* give you more than this for 
$1.50. Send a stamp for sample 
copy. 
D. APPLETON & CO. 
New York City. 
Goerz Dagor 
F. 6.8. 
One of the best endorsements of a lens 
is the assurance that it is as good as a 
“GOERZ DAGOR.” No lens is better 
known or has met more exacting practi- 
cal tests than the famous GOERZ 
DAGOR F 6.8. Today it is more popular 
than ever. It is without question one of 
the best all-around lenses ever made, and 
it may be depended upon by amateur and 
professional photographers to PRO- 
DUCE RESULTS. The brilliancy, defi- 
nition and covering-power of the GOERZ 
DAGOR is unsurpassed. Call at your 
dealer’s. Our lens-booklet contains much 
practical information. Send for it today. 
C. P. GOERZ AMERICAN OPTICAL 
COMPANY 
317 G East 34th Street,, New York City. 
An Achievement in Camera Construction 
New Model 
Ruby 
Reflex 
With World- 
Famous F/4.5 
Cooke Lenses 
Thornton 
Pickard 
England 
The Ruby Reflex Camera is fully 
equipped with the latest and most up-to- 
date practical features, those ensuring 
pictures of perfection. Has a highly per- 
fected focal-plane shutter with safety- 
curtain. One turn of a knob sets the 
shutter for any exposure, automatically 
adjusts the shutter exposure-slit and sets 
the safety-blind. Speed from i/ioth to 
i/ioooth of a second. Has revolving 
back and double-bellows extension. Des- 
criptive circular on request. 
Price: 2 l /\ x 3% $100 
3 l A x 4/4 $120 4x5 $150 
(At Your Dealer’s) 
WILLOUGHBY'S 
no WEST 32ND ST., NEW YORK 
U. S. A. Sales Agents 
