Clark's Practical Methods in Microscopy. Gives in detail descriptions of methods that will lead the careful worker to successful results. 233 pages. Illustrated. $1,60.

Clarke's Astronomical Lantern. Intended to familiarize students with the constellations by comparing them with facsimiles on the lantern face. With seventeen slides, giving twenty-two constellations. $4.50.

Clarke's How to find the Stars. Accompanies the above and helps to an acquaintance with the constellations. 47 pages. Paper. 15 cents.

Eckstorm's The Bird Book. The natural history of birds, with directions for observation and suggestions for study. 301 pages. Illustrated. 60 cents.

Guides for Science Teaching. Teachers' aids for instruction in Natural History.

I. Hyatt's About Pebbles. 26 pages. Paper. 10 cts.
II. Goodale's A Few Common Plants. 61 pages. Paper. 20 cts.
III. Hyatt's Commercial and other Sponges. Illustrated. 43 pages. Paper. 20 cts.
IV. Agassiz's First Lesson in Natural History. Illus. 64 pages. Paper. 25 cts.
V. Hyates Corals and Echinoderms. Illustrated. 32 pages. Paper. 30 cts.
IV. Hyates Mollusca. Illustrated. 65 pages. Paper. 30 cts.
VII. Hyatt's Worms and Crustacea. Illustrated. 68 pages. Paper. 30 cts.
XII. Crosby's Common Minerals and Rocks. Illustrated. 200 pages. Paper, 40 cts. Cloth, 60 cts.
XIII. Richard's First Lessons in Minerals. 50 pages. Paper. 10 cts.
XIV. Bowditch's Physiology. 58 pages. Paper. 20 cts.
XV. Clapp's 36 Observation Lessons in Minerals. 80 pages. Paper. 30 cts.
XVI. Phenix's Lessons in Chemistry. 20 cts. Pupils' Note-book to accompany No. 15. 10 cts.

Rice's Science Teaching in the School. With a course of instruction in science for the lower grades. 46 pages. Paper. 25 cents.

Ricks's Natural History Object Lessons. Information on plants and their products, on animals and their uses, and gives specimen lessons. 332 pages. Illustrated. $1.50

Ricks's Object Lessons and How to Give them.
Vol. I. Gives lessons for primary grades. 200 pages. 90 cents.
Vol. II. Gives lessons for grammar and intermediate grades. 212 pages. 90 cents.

Scott's Nature Study and the Child. A manual for teachers, with outlines of lessons and courses, detailed studies of typical forms of animal and plant life, and chapters on aims and methods and the relation of nature study to expression. 652 pages. Illustrated. Retail price, $1.50