COLLECTING AND PRESERVING MICROSCOPIC PLANTS.

Small plants like Desmids, Diatoms, etc., may be preserved in water, in homeopathic vials, provided a drop of carbolic acid is added to each bottle of material. In this way they will keep for a long time with very little change of color and contents.

J. H. S.

Ohio State University

Six distinct and independent Colleges, each with a Dean and Faculty of its own.

THIRTY SEVEN DEPARTMENTS.Agriculture, Arts, Law,
THIRTY DISTINCT COURSES.Engineering, Pharmacy,
Veterinary Medicine.

Superior facilities for education in Applied Science. Short or special courses for mature students not candidates for degrees.

One hundred and twenty one instructors. Over thirteen hundred students.

FINEST GYMNASIUM IN THE WEST.

For further information address the President,

Dr. W. O. Thompson, State University, Columbus.

Ohio Forest Trees Identified by Leaves and Fruit.

By W. A. Kellerman, Ph. D., Ohio State University.

A neat pamphlet for every one who wishes to learn our native forest trees. Keys simple. Description plain. Can learn the names of the trees easily.

Price reduced from 25 cents to 10 cents.

Also, The Fourth State Catalogue of Ohio Plants.

Bound copies at cost of binding, namely 20 cents.

Gives list of scientific and common names; distribution by counties.

Teachers and others will also be interested in Prof. Kellerman’s Phyto-theca or Herbarium Portfolio, Practical Studies in Elementary Botany, Elementary Botany with Spring Flora, all published by Eldredge & Bro., Philadelphia, to whom apply.

For information or copies of Forest Trees and Catalogue or names of plant specimens of your region address

W. A. Kellerman, Columbus, Ohio

American Entomological Co.

1040 DE KALB AVENUE, BROOKLYN, N. Y.

Lepidoptera Price List No. 2.—Price 5 cents (Refunded to Buyers)

Issued November 15th 1900.

Dealers of all kinds of Entomological Supplies

Manufacturers of the Original and Celebrated SCHMITT INSECT BOXES.

Builders of INSECT CABINETS, ETC.

The Twentieth Century Text Books of Biology.

PLANT RELATIONS, 12mo, cloth$1.10
PLANT STRUCTURES, 12mo, cloth1.20
PLANT STUDIES, 12mo, cloth1.20
PLANTS, 12mo, cloth1.80
ANALYTICAL KEY TO PLANTS, 12mo, flexible cloth.75

All by JOHN MERLE COULTER, A. M., Ph. D., Head of Dept. of Botany, University of Chicago.

They are already the preferred texts, and the reasons will be apparent on examination.

ANIMAL LIFE: A First Book of Zoology.

By DAVID S. JORDAN, M. S., M. D., Ph. D., LL. D., President of the Leland Stanford Junior University, and VERNON L. KELLOGG, M. S., Professor in Leland Stanford Junior University. 12mo. Cloth, $1.20. Now ready.

Not a book for learning the classification, anatomy, and nomenclature of animals, but to show how animals reached their present development, the effects of environment, their place in Nature, their relations to one another and to the human race. Designed for one-half year’s work in high schools. Send for sample pages.

ANIMAL FORMS: A Second Book of Zoology.

By DAVID S. JORDAN, M. S., M. D., Ph. D., LL. D., and HAROLD HEATH, Ph. D., Professor in Leland Stanford Junior University. Ready in February, 1901.

D. APPLETON AND COMPANY, Publishers, New York, Chicago, London.

Recent Scientific Works

In Astronomy, Dr. Simon Newcomb’s new book, published October, 1900; in Physics, the Johns Hopkins text of Professors Rowland and Ames; also in Physics for second and third year high school work, the text of Dr. Hoadley, of Swarthmore; in Physiology, the text by Drs. Macy and Norris, based on the Nervous System; also the High School Physiology indorsed by the W. C. T. U., written by Dr. Hewes, of Harvard University; in Geology, the Revised “Compend” of Dr. Le Conte, and the two standard works of Dana,—The Manual for University Work, and the New Text Book, revision and rewriting of Dr. Rice, for fourth year high school work; in Chemistry, the approved Storer and Lindsay, recommended for secondary schools by the leading colleges; in Zoology, the Laboratory Manual of Dr. Needham, of Cornell; and the Series “Scientific Memoirs” edited by Dr. Ames, of Johns Hopkins. Nine volumes ready.

The publishers cordially invite correspondence.

AMERICAN BOOK COMPANY, Cincinnati