108 



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. 



HP 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. Some matter has been 

 added and some changes made in the translation to adapt it more 

 nearly to English and American readers. Rowland's system of 

 wave-lengths is thoroughly brought down to date. 



Elements of Structural and Systematic Botany. 



For High Schools and Elementary College Courses. By DOUGLAS 

 HOUGHTON CAMPBELL, Ph.D., Professor of Botany in the Leland Stan- 

 ford Junior University. 12mo. Cloth, ix + 253 pages. Price by 

 mail, $1.25; for introduction, $1.12. 



rpHE 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. Tradition has been discarded throughout, 

 and the most recent and reliable authorities are followed. 



K. Ellsworth Call, Teacher of 

 Natural Science, High School, West 

 Des Moines, la. : It is the only 

 manual which combines just enough 



Plant Organization. 



technic with a logical treatment of 

 the more minute structure of plants 

 to render it a help to the teacher of 

 to-day. 



tion, 75 cents. 

 TT consists of a synoptical review of the general structure and 



morphology of plants, with blanks for written exercises by 

 pupils. 



