TEXT-BOOKS OF SCIENCE 
ASTRONOMY 
LOOMIS’S ELEMENTS OF ASTRONOMY 
The Elements of Astronomy. Designed for Academies and 
High Schools. By Elias Loomis, LL.D., Late Professor of 
Astronomy in Yale College, pp. 254, 12mo, Sheep, $1 00. 
The plan of this volume is essentially the same as that of the Treatise on 
Astronomy mentioned below, with the omission of some of the mathematical 
portions. Such mathematics as are included in this volume require only a 
knowledge of a few of the most elementary principles of algebra, geometry, 
and plane trigonometry. The author says in his preface: “ Without some 
mathematical knowledge it is impossible to form an adequate idea of the 
Substantial basis upon which the calculations of astronomy rest.” 
LOOMIS’S PRACTICAL ASTRONOMY 
An Introduction to Practical Astronomy. With a Collection 
of Astronomical Tables. Designed to Supplement the 
Treatise on Astronomy. By Elias Loomis, LL.D., Late 
Professor of Astronomy in Yale College, pp. 506. 8vo, 
Sheep, $1 50. 
While the attention of so many persons is earnestly directed to the im¬ 
provement of practical astronomy, the want of suitable text-books on this 
subject has been extensively felt. Some work has been needed which should 
not only give a description of the instruments required in the outfit' of an 
observatory, but which should also explain the methods of employing them 
and the computations growing out of their uses. In this book Professor 
Loomis has endeavored to fill this want. 
LOOMIS’S TREATISE ON ASTRONOMY 
A Treatise on Astronomy. Designed for the Instruction of 
College Classes in the First Principles of Astronomy. By 
Elias Loomis, LL.D., late Professor of Astronomy in Yale 
University, pp. 342. 8vo, Sheep, $1 50. 
The author’s aim has been to limit this book to such dimensions that it 
may be read without omissions, and to make such a selection of topics aS 
