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NEW STAR ATLAS FOR THE LIBRARY, the School, and the Observatory, in Twelve Circular Maps (with Two Index-Plates). With an Introduction on the Study of the Stars. Illustrated by 9 Diagrams. Crown 8vo. , 55. THE SOUTHERN SKIES : a Plain and Easy Guide to the Con- stellations of the Southern Hemisphere. Showing in 12 Maps the position of the principal Star-Groups night after night throughout the year. With an Introduction and a separate Explanation of each Map. True for every Year. 4to. , ss. HALF-HOURS WITH THE STARS : a Plain and Easy Guide to the Knowledge of the Constellations. Showing in 12 Maps the position of the principal Star-Groups night after night throughout the year. With Introduction and a separate Explanation of each Map. True for every Year. 410., y. net. LARGER STAR ATLAS FOR OBSERVERS AND STUDENTS. In Twelve Circular Maps, showing 6coo Stars, 1500 Double Stars, Nebulae, etc. With 2 Index-Plates. Folio, i&r. THE STARS IN THEIR SEASONS : an Easy Guide to a Knowledge of the Star-Groups. In 12 Large Maps. Imperial 8vo., 55. ROUGH WAYS MADE SMOOTH. Familiar Essays on Scientific Subjects. Crown 8vo., y. 6d. PLEASANT WAYS IN SCIENCE. Crown 8vo. 5 3*. 6d. NATURE STUDIES. By R. A. PROCTOR, GRANT ALLEN, A. WILSON, T. FOSTER, and E. CL.ODD. Crown 8vo., 3?. 6d. LEISURE READINGS. By R. A. PROCTOR, E. CLODD, A WILSON, T. FOSTER, and A. C. RANYARD. Crown 8vo., y. 6d.

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