NATURAL SCIENCE TEXT-BOOKS. 
ELEMENTS OF PHYSICS. A Text-book for High Schools and Academies, By 
niger P. Gace, A.M., Instructor in Physics in the English High School, Bos- 
ton. 1.12. 
C. F. Emerson, Prof. of Physics, Dartmouth College: “It takes upsthe subject 
on the right plan, and presents it in a clear yet scientific way.” 
INTRODUCTION TO PHYSICAL SCIENCE. By A. P. Gacg, author of “‘ Elements 
of Physics.” $1.00. 
B. F. Sharpe, Prof. of Natural Science, Randolph-Macon College, Va.: “It is 
the very thing ior the academy preparatory to this college.” 
PHYSICAL LABORATORY MANUAL AND NOTE-BOOK. By A. P. Gacg, author 
of ‘* Elements of Physics,” ‘‘ Introduction to Physical Science,” etc. 35 cents. 
I. Thornton Osmond, Prof. of Physics, Penn. State College: ‘‘\t is a product 
of the ability, experience, and sound judgment that have made Dr. Gage’s other books 
the best of their rank in physics.” ? 
INTRODUCTION TO CHEMICAL SCIENCE. By R. P. Wittiams, Instructor in 
Chemistry in the English High School, Boston. 80 cents. 
Arthur B. Willmot, Prof. of Chemistry, Antioch College, Ohio: ‘It is the best 
chemistry I know of for high-school work.” 
LABORATORY MANUAL OF GENERAL CHEMISTRY. By R. P. Wi uiams, 
author of ‘f Introduction to Chemical Science.” 25 cents. 
W. M. Stine, Prof. of Chemistry, Ohio University, Athens, Ohio: “\t is a work 
that has my heartiest indorsement. I consider it thoroughly pedagogical in its prin- 
ciples.” 
YOUNG’S GENERAL ASTRONOMY. A Text-book for Colleges and Technical 
Schools. By Cuartes A. Youna, Ph.D., LL.D., Prof. of Astronomy in Prince-~ 
ton College, and author of “* The Sun,” etc. $ 2.25. 
S. P. Langley, Sec. Sizthsontan Institution, Wash., D.C., and Pres. National 
Academy of Sciences ; “1 know no better book (not to say as good a one) for its pur- 
pose on the subject.” 
YOUNG’S ELEMENTS OF ASTRONOMY. A Text-book for Use in High Schools and 
Academies, with a Uranography. By CuHartes A. Youn, author of ‘‘ Young’s 
General Astronomy,” ‘he Sun,” etc. $1.40. Uranography. From ‘‘ Young’s 
Elements of Astronomy.’’ 30 ceuts. 
S. H. Brackett, Teacher of Mathematics, St. Yohnsbury Academy, Vt.: “It 
is just what I expectec it would be, the very best which I have ever seen.” 
YOUNG’S LESSONS IN ASTRONOMY. Including Uranography. By CHarres A. 
Younc, author of ‘‘ A General Astronomy,’’ ‘‘ Elements of Astronomy,” etc. 
Prepared for schools that desire a brief course free from mathematics. $1.20. 
AN INTRODUCTION TO SPHERICAL AND PRACTICAL ASTRONOMY. By 
Dascom GREENE, Prof. of Mathematics and Astronomy in the Rensselaer Poly- 
technic Institute, Troy, N.Y. $1.50. 
Davis Garber, Prof of Astronomy, Muhlenberg College: ‘‘Students pursuing 
astronomy on a practical line will find it a very excellent and useful book.” 
ELEMENTS OF STRUCTURAL AND SYSTEMATIC BOTANY. For High 
Schools and Elementary College Courses. By Doucras Houcuton CamMpBELL, 
Ph.D., Prof. of Botany in the Indiana University. $1.12. 
Charles W. Dodge, Teacher of Botany, High School, Detrott, Mich.: “It is the 
only English work at all satisfactory for high-school students.” 
BLAISDELL’S PHYSIOLOGIES: Our Bodies and How We Live, 65 cents; How 
to Keep Well, 45 cents; Child’s Book of Health, 30 cents. 
True, scientific, interesting, teachable. 
ELEMENTARY METEOROLOGY. By Witi1am M. Davss, Prof. of Physical Geogra- 
phy in Harvard University. With maps, charts, and exercises. $2.50. 
Copies will be sent, post paid, to teachers for examination on receipt of the introduc 
tion prices given above. 
GINN & COMPANY, Publishers. 
Boston. New York. Cuicaco. Lonpon. 
