Part 3

By ANNA BOTSFORD COMSTOCK, Lecturer in Nature-Study in Cornell University. Cloth 8vo. XVIII. + 938 pages, more than 1,000 illustrations. Prices, postpaid: Bound in one volume, $3.65; bound in two volumes, $4.50; Volume I., including Animal Life, $2.25; Volume II., including Plant Life, $2.25. Sample pages sent on application.

A handbook of Nature-Study for teachers and parents, based on the Cornell Nature-Study Leaflets, with much additional material and many new illustrations.

=GAGE--Optic Projection=

By SIMON HENRY GAGE, Professor Emeritus of Histology and Embryology in Cornell University, and Henry Phelps Gage, Ph. D.

This work of over 700 pages and with over 400 figures is of especial interest to workers in all fields of Biology in that it deals especially with the use of the Projection Microscope for demonstrations and for drawing. It also gives the fundamental principles of all the forms of projection. A 16-page circular will be sent on request. Postpaid, $3.00.

=RILEY--Handbook of Medical Entomology=

By WM. A. RILEY, Ph. D., Professor of Insect Morphology and Parasitology in Cornell University and O. A. JOHANNSEN, Ph. D., Professor of Biology in Cornell University.

A concise account of poisonous, and disease-carrying insects and their allies, including descriptions and illustrations of the principal species, with keys for their determination, and method of control. Bound Library Buckram, medium 8vo. Nearly 375 pages. Price $2.00 net.

The Comstock Publishing Company Cornell Heights, Ithaca, N. Y.

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Choice Mineral Specimens

It affords this establishment pleasure to state that though we are over fifty years old we are still seeking with youthful energy new finds of choice mineral specimens.

A few of our recent additions will show from what widely distributed areas we draw:

=Japan=: =Chalcopyrite= in groups of sharp crystals, some of them beautifully iridescent.

=Stibnite=, brilliant crystals, 5 to 8 inches long.

=Hokutolite=, a new radio-active barium-lead silicate.

=Reinite=, in large, sharp crystals.

=Quartz Twins=, fine, large crystals.

=Rhodesia=: =Malachite=, beautiful polished specimens showing concentric banding.

=Hopeite=, in small groups of excellent crystals.

=Madagascar=: =Betafite=, a new uranium niobate, in good crystals.

=Euxenite=, good crystals.

=Beryl=, in large brown crystals with pyramidal faces.

=California=: =Tourmaline=, polished transverse sections of large crystals of rich red and green colors.

=Kunzite=, superb gem crystals.

=Benitoite= and =Neptunite= in fine crystals and groups.

=Greenockite= on =Magnetite=, uncommonly good.

=Utah=: =Willemite=, drusy masses of colorless and red crystals.

=Aurichalcite=, singularly beautiful robin's-egg blue, crystallized coatings.

=Nova Scotia=: =Magnesite= in groups of small distinct hexagonal crystals.

New lots of fine specimens are constantly arriving. Ask for price-list No. 160.

Cheap minerals are described in No. 158.

Circular No. 170 enumerates all of our many catalogues and price-lists.

Ward's Natural Science Establishment 84-102 College Avenue Rochester, N. Y.

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Entomological News

A forty-eight page illustrated magazine, published monthly except August and September, devoted to the study of INSECT LIFE. It contains a list of the titles of the current Entomological Literature, and also articles by the leading Entomologists in the United States and Canada. Valuable information for the beginner, the economic entomologist and the systematist.

To new subscribers, $1.90; Renewals, $2.00; payable in advance. Single copies 25 cents. Address

ENTOMOLOGICAL NEWS 1900 Race Street, Philadelphia, Pa.

=================================================================== CLASS WORK MATERIAL

CAN BE PROCURED AT ANY TIME OF THE YEAR FROM

C. S. BRIMLEY, Zoologist

1135 Newberne Avenue RALEIGH, N. C., U. S. A.

Twenty-one years' experience Price List on Application

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To Entomologists

I can supply Entomologists with all orders of insects from all parts of the world, as I am continually receiving fresh consignments from my own collectors.

General lists of Lepidoptera and Coleoptera on application; also special lists of Sphingidæ, over 300 species, of Pieridæ in papers, over 100 species. Collections just received from Natal, Madagascar, Peru, Ivory Coast, French Guiana, Java and Argentine; selections of these at low rates. Particulars on application.

E. LE MOULT 4 Rue Duméril, Paris XIII, France

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Do Business by Mail

It's profitable, with accurate lists of prospects. Our catalogue contains vital information on Mail Advertising. Also prices and quantity on 6,000 national mailing lists, 99% guaranteed. Such as:

War Material Mfrs. Axle Grease Mfrs. Cheese Box Mfrs. Railroad Employees Shoe Retailers Contractors Tin Can Mfrs. Fly Paper Mfrs. Druggists Foundries Auto Owners Farmers Wealthy Men Fish Hook Mfrs. Ice Mfrs. Feather Duster Mfrs. Doctors Hotels

Write for this valuable reference book. Ross-Gould, 1027A Olive Street, St. Louis.

Ross-Gould Mailing Lists St. Louis

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Pomona College

Located in one of the most healthful and beautiful parts of the west coast. The mountains reach an elevation of ten thousand feet within a few miles of the college and these with the nearby ocean afford many special advantages for the study of things not in books. Special advantages are afforded by the fact that the college limits its attendance, the freshman class being restricted to two hundred applicants. The success of the college is particularly indicated by the large proportion of the graduates who proceed to advanced work in the large universities. In addition, well-manned departments of music and art afford exceptional advantages.

For further information, address

Secretary of Pomona College Claremont, California