' Our... 
Vocation 
is Physiological Optics. 
Our avocation of late 
has been testing the 
eyes of our domestic 
animals and we can as¬ 
sure you that they sel¬ 
dom need glasses. 
We cannot say as much for the human eye; for defects 
requiring glasses for their correction are very numerous, and 
too often neglected. Few people realize the exactness with 
which these defects can now be corrected. 
. BROWN & BURPEE, 
THE KENNARD. 
If You Teach or Study Birds 
VOU NEED BIRD - LORE. 
Edited by FRANK M. CHAPMAN.* 
For it will tell you just what to teach and 
just what to study at the proper season. 
Bird Lore’s Advisory Council has representatives in nearly 
every state in the Union and province in Canada,who will 
respond to your requests for information and advice. 
Bird Lore’s Illustrations from photographs of wild birds in 
their haunt's, are exact reproductions of nature itself, and 
far more interesting and instructive than drawings. 
From hundreds of unsolicted, commendatory letters we quote 
by permission, the following: 
“I recommend the magazine at all possible places and at all possible times 
as the very best nature study magazine in America.” 
Anna Botsford Comstock. 
Cornell University , November 1, 1900. 
“ I wish to congratulate you on the excellent features, new and old, that 
make Bird-Lore the most practical and ideal magazine for nature study in its 
field. C. F. Hodge. 
Clark University, December 8, 1900. 
20 CENTS A NUMBER. $1 00 A YEAR. 
Send a two-cent stamp for a specimen copy. 
The Macmillan Co'y* 
Crescent and Mulberry Sts. 
HARRISBURG, PA. 
