valuable to all institutions having an equatorial telescope Indeed, they greatly enhance the value of the work for al classes of students. 4. Several small constellations that were delineated on the maps, but were not described in former editions of the book, have been described, and their history given in the presen edition. 5. The page of the book has been greatly enlarged, for the double purpose of printing more matter and in larger type: and to afford scope for wood-cut illustrations. Of these, great numbers have been introduced into the second part of the work, adapting it, in this respect alsc, to the wants of both teacher · and student. 6. Still further to illustrate the second part of the work, the first map of the atlas has been re-drawn and re-engraved, so as to illustrate more and better than the old map. 7. Two entirely new maps have been introduced into the Atlas, containing views of eighty different celestial objects; such as Double Stars, Clusters, Nebulæ, Comets, &c. These are all referred to in the book, and in turn refer from the objects back to the page of the book where they are described. These maps and the corresponding descriptions in the book will be found not only extremely interesting, but of incalculable value to the student. 8. A chapter on the history, structure and use of Telescopes, Transit Instruments, &c., has been introduced-a subject which every student of astronomy should understand, but one to whicb no attention was given in the previous editions. Such are some of the principal new features of the present edition-larger type, new questions, telescopic objects, new maps, ucw matter, and numerous illustrations, making it the most perlect and complete text-book of astronomy ever offered to the American public. New York, Iniu 1866. REVISED IN 1873. H. MATTISON "XIV. Via Lactea, or Milky-Way, 66 XV. Origin of the Constellations, APTER 1. General Phenomena of the Solar System, History, &c., IV. The Moon--Her Distance, Motions, Phases, &c., |