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 THE UNIVERSITY SERIES

I-ON THE PHYSICAL BASIS OF LIFE. By Prof. T. H. HuELET, LL.D. F.R.S. Wih an introduction by a Profeesor in Yale Collegs, 12mo, pp. 36. Paper Covers Price 25 oenta.

II-THE CORRELATION OF VITAL AND PHYSICAL FORCES. By Prof. GEORGE F. BARKER, M.D., of Yale College. 36 pp. Paper Covers. Price 250.

III AS REGARDS PROTOPLASM, in relation to Prof. Hurloy's Physical Basis of Life, By J. HUTOKISON STIRLING, FR.CS. pp. 72. Prico 25 cents.

IV-ON THE HYPOTHESIS OF EVOLUTION, Physical and Metaphysical By Prof EDWARD D. COPE, 12mo., 79 pp. Paper Covers. Price 25 cents.

V-SOBNTIFIO ADURESSES-L On the Methods and Tendencies ef Physical Investigation. Ore Base and Dust 3. On the Scientific Use of the Imagination By Prof. Jous TYNDALL, FRS. 12mo, 74 PP. Paper Covers. Price 25 cents. Flex. cloth, 33 ets.

NO. VI-NATURAL SELECTION AS APPLIED TO MAN, B ALFRED RUSSELL WALLACE. Thin pamphlet treats (1) of the Development of Human Rices tuder the law of selection; (2 the limts of Nat- aral Selection ds applied to man. 54 pp Price A5 oents.

NO. VII-SPECTRUM ANALYSIS, & Th-oe lectures by Profs. Roscos, Huggios, and Lockyer, Finely illustrated. 88 pp. Paper Covers. Price 25 cents

NO. VIII THE SUN. A sketch of the present state of scientific opinion as regards this body, with unnoconnt of the most recent discoveries and methods of observation, By Prof. C. A. YOUNG, PhD., of Dartmonth College. 58 pp. Paper Covers. Frice 5 cents.

NO. IX-THE EARTH A GREAT MAGNET. By A. M. MAYEB, Ph.D., of Stevens Institute A most profoundly interesting lootare on the subject of magnetism. 72 pp. Paper Cover, Price ta cent Flexible Cloth, 50 cents.

NO. X-MY8TERIES CF THE VOICE AND EAR By Prof. O. N. RooD, Columbus College, New York. One of the most interesting loctitres on sound erar delivered. Original discoveries, brilliant experiments. Beautifully illus. U8 pp. Paper Covers 25 cts.