II. CLASSIFICATION OF NATURE

Section A. Realms of Nature. Detailed treatment of various departments in a literary and popular way. 8vo. 7½ × 10¼ in.

Already publisht:

FERNS, by Campbell E. Waters, of Johns Hopkins University. 8vo, pp. xi + 362. $3.00 net; by mail, $3.30.

Section B. Identification Books—

1. Library Series, very full descriptions. 8vo. 7½ × 10¼ in.

Already publisht:

NORTH AMERICAN TREES, by N.L. Britton, Director of the New York Botanical Garden. $7.00 net; carriage extra.

2. Pocket Series, "How to Know," brief and in portable shape.

III. FUNCTIONS OF NATURE