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A8TU0N0MY 

 LOOMIS'S ELEMENTS OF ASTRONOMY 

 The Elements of Astronomy. Designed for Academies 

 and High Schools. By Elias Loomis, LL.D., late Pro- 

 fessor of Astronomy in Yale College, pp. 354. 13mo, 

 Sheep, II 00 ; by mail, $1 10. 



The plan of this volume is essentially the same as that of Ihe 

 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 tlie most elemen- 

 tary principles of algebra, geometry, and plane trigonometry. 



LOOMIS'S PRACTICAL ASTRONOMY 



An Introduction to Practical Astronomy. With a Col- 

 lection of Astronomical Tables. Designed to Supple- 

 ment the Treatise on Astronomy. By Elias Loomis, 

 LL.D., late Professor of Astronomy in Yale College. 

 pp. 506. 8vo, Sheep, 11 50 ; by mail, $1 G3. 



Professor Loomis has supplied the demand for a work 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 tliem and the computations growing out of their uses. 



LOOMIS'S TREATISE ON ASTRONOMY 



A Treatise on Astronomy. Designed for the Instruc- 

 tion of College Classes in the First Principles of As- 

 tronomy, By Elias Loomis, LL.D., late Professor of 

 Astronomy in Yale College, pp. 342. 8vo, Sheep, 

 $1 50 ; by mail, $1 63. 



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 shall embrace everything most important to the student. 

 Wherever it could be done to advantage, simple matliematical prob- 

 lems have been introduced. There is also a discussion of various 

 phenomena, such as tlie constitution of the sun, the condition of the 

 moon's surf;ice, the phenomena of eclipses, the law of tides, etc. 



