The illustrations include sketches from the author's laboratory and expeditions, and numerous reproductions from astronomical photographs.
_Copies of the above books will be sent, prepaid, to any address on receipt of the price by the Publishers:_ American Book Company NEW YORK.

CINCINNATI.

CHICAGO * * * * * Birds of the United States A Manual for the Identification of Species East of the Rocky Mountains By AUSTIN C.APGAR Author of "Trees of the Northern United States," etc.
Cloth, 12mo, 415 pages, with numerous illustrations.

Price, $2.00 The object of this book is to encourage the study of Birds by making it a pleasant and easy task.

The treatment, while thoroughly scientific and accurate, is interesting and popular in form and attractive to the reader or student.