2 
TEXT-BOOKS OF SCIENCE 
shall embrace everything most important to the student. Wherever it could 
be done to advantage, simple mathematical problems have been introduced, 
and at the close of the book will be found a collection of miscellaneous 
problems, many of them extremely simple, which may be used at the discre¬ 
tion of the teacher. A further discussion of various phenomena, such as the 
constitution of the sun, the condition of the moon’s, surface, the phenomena 
of eclipses, the law of tides, etc., has been entered into, in the hope that such 
discussion will enhance the interest of the subject for the class of students 
who might be repelled by a treatise exclusively mathematical. 
NEWCOMB’S POPULAR ASTRONOMY 
Popular Astronomy. By Simon Newcomb, LL.D., Super¬ 
intendent American Nautical Almanac; formerly Professor 
U. S. Naval Observatory With One Hundred and Twelve 
Engravings and Five Maps of the Stars, pp. xviii., 578 . 
12mo, Cloth, $1 30. 
The historic and philosophic sides of the subject have been treated with 
greater fulness than is usual in works of this character, while the purely 
technical side has been proportionately condensed. Owing to the great in¬ 
terest which now attaches to the question of the constitution of the sun, it 
was deemed desirable to present the latest views of the most distinguished 
investigators of this subject from their own pens. Four of these gentlemen 
—Rev. Father Secchi, of Rome; M. Faye, of Paris; Professor Young, of 
Dartmouth College; and Professor Langley, of Allegheny Observatory—have, 
at the author’s request, presented brief expositions of their theories, which 
will be found in their own language in the chapter on the sun. 
WARREN’S RECREATIONS IN ASTRONOMY 
Recreations in Astronomy 7 . 
Experiments and Telescopic 
D.D. pp. xiv., 29*2. With 
Plates. 12mo, Cloth, $1 25. 
Written not only to reveal some of the 
highest achievements of the human mind, 
but also to let the heavens declare the 
glory of God. With sentiments of pro¬ 
found devotion, and with the calmest be¬ 
lief that religion gains by every advance of 
science, he invites the reader to scan the 
heavens, and there find proofs strong as 
With Directions for Practical 
Work. By II. W. Warren, 
83 Illustrations and Colored 
holy writ of the truths of revealed faith— 
Chicago Times. 
The explanations of difficult matters are 
particularly lucid, and for readers not 
technically instructed in astronomy noth¬ 
ing could be better as a literary presenta¬ 
tion of the attractive side of the science.— 
N. Y. Post. 
