110 NATURAL SCIENCE. 
Scheiner’s Astronomical Spectroscopy. 
Department of Special Publication. — Translated, revised and en- 
larged by E. B. Frost, Associate Professor of Astronomy in Dart- 
mouth College. 8vo. Half leather. Illustrated. xiii+ 482+ pages. 
Price by mail, $5.00; for introduction, $4.75. 
HIS work aims to explain the most practical and modern 
methods of research, and to state our present knowledge of 
the constitution, physical condition and motions of the heavenly 
bodies, as revealed by the spectroscope. 
There are three parts : — I. Spectroscopic Apparatus ; II. Spec- 
tral Theories; III. Results of Spectroscopic Observations, with a 
fourth containing tables of wave-lengths of lines of the solar 
spectrum, catalogues of stars with special types of spectra, and a 
full bibliography brought down to 1893. 
- Edward S. Holden, Director of the|all astronomers and _ students of 
Lick Observatory, Mt. Hamilton, | spectroscopy. 
California: I congratulate you on| W. W, Campbell, Astronomer, 
the appearance of this very impor-| Lick Observatory, University of 
tant book; it is indispensable to} California: I have only words of 
praise to bestow upon the book. 
Elements of Structural and Systematic Botany. 
For High Schools and Elementary College Courses. By DouGuas H. 
CAMPBELL, Professor of Botany in the Leland Stanford Junior Univer- 
sity. 12mo. Cloth. ix+253 pages. Price by mail, $1.25; for intro- 
duction, $1.12. 
(HE fundamental peculiarity and merit of this book is that it 
begins with the simple forms, and follows the order of nature 
to the complex ones. 
R. Ellsworth Call, Teacher of | technic with a logical treatment of 
Natural Science, High School, West | the more minute structure of plants, 
Des Moines, Ia.: It is the only | to render it a help to the teacher of 
manual which combines just enough | to-day. 
Plant Organization. 
By R. Hatstep Warp, M.D., F.R.M.S., Professor of Botany in the 
Rensselaer Polytechnic Institute, Troy, N.Y. Quarto. 176 pages. 
Illustrated. Flexible boards. Mailing price, 85 cents; for introduc- 
tion, 75 cents. 
T consists of a synoptical review of the general structure and 
morphology of plants, with blanks for written exercises by 
pupils. 
