Part 43

The Worth Knowing Series forms a much needed in-between link to the larger Nature Library books and the handy, but necessarily limited, Pocket Nature Guides.

Each of these four volumes covers the most interesting American varieties of the subject treated.

A general introduction to each subject is followed by detailed descriptions of the most interesting families, and of the more important members in each group.

EACH VOLUME, NET, $1.60

THE BIRD STUDY BOOK

By T. GILBERT PEARSON

The idea here is to present a bird book in which the beginner or the child can get in simple language the fundamental facts of bird study. Mr. Pearson, as Secretary of the National Association of Audubon Societies, is one of the best informed writers on birds in America.

He is just the author to kindle enthusiasm. A few of the questions and subjects suggested by a reading of “The Bird Study Book” are:

How to get on neighborly terms with the birds.

Do birds have more than one mate?

Bird spinsters.

What bird is called the “Outcast”?

What birds winter in your particular locality?

How many birds are there in the world?

Birds that are no more—the story of the Labrador Duck, the Great Auk, the Wild Pigeon.

All about bird boxes.

Colored Frontispiece Pen and ink drawings by WILL SIMMONS, and 16 photographs. Net, $1.25

THE TREE GUIDE

By JULIA ELLEN ROGERS, Author of “The Tree Book”

THE TREE GUIDE is uniform in style and size with the well-known pocket Bird Guides which have become so universally popular. It contains illustrations and descriptions of the trees of the country. The descriptions include the range, the classification, the distinctive features such as flowers, leaves, fruit, etc., and all other marks that lead to an easy identification of the tree. An ideal volume for expert naturalist or amateur for field work or even more exhaustive study.

32 illustrations in color; many in black and white. Cloth, net, $1.00; Leather, net, $1.25

THE BUTTERFLY GUIDE

By Dr. W. J. HOLLAND Author of “The Butterfly Book,” “The Moth Book,” Etc. Similar to the “Pocket Nature Guides”

This is the first Butterfly Book of pocket size giving each species in its natural colors. It is uniform in style and binding to the popular Pocket Nature Guides series, and makes a valuable companion volume to these books.

Dr. Holland, Director of the Carnegie Museum, Pittsburg, is the greatest butterfly authority in the country, and has had more experience in the mounting and artistic posing of moths and butterflies than any other living man. The plates in the Pocket Guide are entirely new and reproduced by a special process under Dr. Holland’s personal supervision, from specimens in his own collection.

This book is the most authoritative and valuable guide for field use ever published. It makes the identification of our common butterflies a simple matter for amateurs.

Illustrations of 250 butterflies in their natural colors.

Index. Boxed. Flexible Linen, net, $1.00; Full Limp Leather, net, $1.25