Binoculars for Nature Study 
BUSHNELL PRISM BINOCU- 
LARS provide high quality at 
low price. Clarity of optical 
systems compares favorably 
with expensive American- 
made or pre-war German 
binoculars. 
BUSHNELL BINOCULARS are accurate — color-corrected — collimated 
for perfect alignment. Lightweight magnesium body. Prisms and 
lenses coated for increased brilliance. Sold with guarantee certificate, 
leather carrying case and straps. 
The Illinois Audubon Society offers two models, selected particularly 
for bird students: 
7 power, 35 mm: Field 375 ft. at 1000 yds. Exit pupil, 
5 mm. Light efficiency, 87. Center focus. Weight 17 oz.; 
height,” 464 inches e721. eee een ee Each $58.50* 
6 power, 30 mm: Field 445 ft. at 1000 yds. Exit pupil, 
5 mm. Light efficiency, 37. Center focus. Weight 15% oz.; 
height 414 “inches oe ene eee Each $43.50" 
Buy your binoculars through the Society and support its work in 
protecting birds and wildlife. To order, write the Illinois Audubon 
Society, Chicago Museum of Natural History, Roosevelt Road and 
Lake Shore Drive, Chicago 5, Illinois. 
* Plus 10% Federal Excise Tax 
Audubon Bird-Calls 
A simple birch cylinder with a metal handle, two inches long over 
all, weighing a few ounces. When twisted, it produces sounds that 
attract a variety of sone vbirds.1....5 eee Each $1.25 
Books for Nature Study 
FIELD GUIDES NATURE LITERATURE 
ILLINOIS AUDUBON SOCIETY will fill mail orders for almost any 
book in the field of ornithology, nature study or conservation. Books 
not now at hand can be obtained following receipt of order. The 
following volumes are in stock: 
A Guide to Bird Finding, by Olin S. Pettingill. $6.00. 
Field Guide to the Birds, by Roger T. Peterson. $3.75. 
A Guide to Bird Watching, by Joseph J. Hickey. $4.00. 
Exploring Our National Parks, Devereux Butcher. $2.50. 
Birds at Home, by Marguerite Henry. $2.00. 
Traveling with the Birds, by Rudyerd Boulton. $2.00. 
Golden Nature Guide Books. A series of nature guides, pocket 
size, for children and beginners. We have the following 
volumes: Birds; Wild Flowers; Insects; Stars. $1.00 each. 
