NATURAL S CIENCE T EXT-BOOKS

BLBBDWTS OF PH7SICS. A Text-book for High Scbools and Académies. By Alfred P. Gagb, A.M.» Instnictor in Phjsics m the English High School, Bo»ton. $ i.ia.

C. P. Rmeraon, Prof . of Phjsics, Dartmouih Collège: " It takes up the sabject on the right plan, and présents it m a clear yet scientific way."

DITRODUCTION TO PHY8ICAL 8CIBNCB. By A. P. Gagb, author of " Eléments of Physics." $ z.oo.

B. F. Sbarpe, Prof, of Naiural Science^ Randol^h-Macon Collège, Va, : " It is the very thing tor the academy preparatory to this collège." PHTSICAL LABORATORT MAKUAL AITD NOTB-BOOK. By A. P. Gagb, author

of *' Eléments of Physics/' ** Introduction to Physical Science/' etc. 35 cents. L Thomton Osmond, Prof of Phystcs^ Penn, State Collège : " It is a product of the ability, expérience, and sotmd judgment that bave made Dr. Gage's other books the best of their rank in pbysics." INTRODUCTION TO CHEMICAL SCEBNCB. By R. P. Williams, Instnictor in

Chemistry in the Euglish High School, Boston. 80 cents. Arthur B. Willmot, Prof, of Chemistry, Anizoch Collège, Ohio: "It is the best chemistry I know of for bigh-scnool work." LABORATORT MANUAL OF GENERAL CHBMISTRT. By R. P. Williams,

authOT of " Introduction to Chemical Science." 35 cents. W. M. Stlne, Prof of Chemistry, Ohio University, Athens, Ohio: " It is a work diat bas my heartiest indorsement. I consider it thoroughly pedagogical in its prindples." YOUNG'S GENERAL ASTR0N0M7. A Text-book for Collèges and Technical

Scbools. By Charles A. Young, Ph.D., LL.D., Prof, of Astronomy in Prince*

ton Collège, and author of " The Sun," etc. $ 3.25. S. P. Lanfirlev*, Sec. Smithsonian Institution, Wash., D.C, and Près, National Academy of Sciences : " 1 know no better book (not to say as good a one) for its purpose on the subject." YOUNG'S ELEMENTS OF ASTRONOMT. A Text-book for Use in High Schools and

Académies, with a Uranography. By Charles A. Young, author of ** Young's

General Astronomy," '' The Sun," etc. $ z.40. Uranography. From ** Young's

Eléments of Astronomy." 30 cents.

S. H. Biackett, Teacher of Mathematics, St. fohnshury Academy, Vt, : " It is just what I expected it would oe, the very best which I bave ever seen." YOUNG'S LESSONS IN ASTRONOMT. Including Uranography. By Charles A.

Young, author of " A General Astronomy," " Eléments of Astronomy," etc.

Prepared for scbools that désire a brief course free from mathematics. $ z.ao. AN INTRODUCTION TO SPHERICAL AND PRACTICAL ASTRONOMT. By

Dascom Grebne, Prof, of Mathematics and Astronomy in the Rensselaer Poly-

technic Institute, Troy, N.Y $ z.50.

Davis Garber, Prqf of Astronomy, Muhlenherg Collège : " Students pursuing astronomy on a practical line vill find it a very excellent and useful book." ELEMENTS OF STRUCTURAL AND 8TSTEMATIC DOTANT. For High

Schools and Elementary Colleee Courses. By Douglas Houghton Campbell,

Ph.D., Prof, of Botany m the Indiana University. $ z.za. Charles W. Dodge, Teacher of Botany, High School, Détroit, Mie h. : " It is the only English work at ail satisfactory for high-school students." BLAISDELL'S PHTSIOLOGIES : ùvr Bodies and How We liTe, 65 cents ; How

to Keep Well, 45 cents ; Cbild's Book of Healtli» 30 cents.

True, scientific, interesting, teacha|?le.

ELEMENTART BÎETEOROLOGT. By William M. Davis, Prof, of Physical Gcogratphy in Harvard University. With maps, charts, and exercises. ^2.50.

Copies will bc sent, post paîd, to teachers for examînatîon on receipt of the introduc don priées given above.

GINN & COMPANY, Publishers.

Boston. Nbw Yoric Chicago. Lomdon.