Binoculars for Nature Study 
BUSHNELL PRISM BINOCULARS provide high quality at low price. 
Clarity of optical systems compares favorably with expensive Amer- 
ican-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, 37. Center focus. Weight 17 oz.; 
height, 454 inches:,4:. 22.212... 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, 444 inches... ee 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 20% Federal Excise Tax 
Books for Nature Study 
FIELD GUIDES TEXTBOOKS 
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. $5.00. 
Field Guide to the Birds, by Roger T. Peterson. $3.50. 
A Guide to Bird Watching, by Joseph J. Hickey. $4.00. 
The Migration of Birds, by Frederick C. Lincoln. $1.00. 
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. 
