PLEASANT WAYS IN SCIENCE. WORKS BY RICHARD A. PROCTOR. LIGHT SCIENCE FOR LEISURE HOURS: Familiar Essays on Scientific Subjects. Crown 8vo, 3_s._ 6_d._ THE ORBS AROUND US: A Series of Essays on the Moon and Planets, Meteors and Comets. With Charts and Diagrams. Crown 8vo, 3_s._ 6_d._ OTHER WORLDS THAN OURS: The Plurality of Worlds Studied under the Light of Recent Scientific Researches. With 14 Illustrations. Crown 8vo, 3_s._ 6_d._ OTHER SUNS THAN OURS: A Series of Essays on Suns—Old, Young, and Dead. With other Science Gleanings. Two Essays on Whist, and Correspondence with Sir John Herschel. With 9 Star Maps and Diagrams. Cr. 8vo, 3_s._ 6_d._ THE MOON: Her Motions, Aspects, Scenery, and Physical Condition. With Plates, Charts, Woodcuts, &c. Crown 8vo, 3_s._ 6_d._ UNIVERSE OF STARS: Presenting Researches into and New Views respecting the Constitution of the Heavens. With 22 Charts and 22 Diagrams. 8vo, 10_s._ 6_d._ LARGER STAR ATLAS for the Library, in 12 Circular Maps, with Introduction and 2 Index Pages. Folio, 15_s._; or Maps only, 12_s._ 6_d._ NEW STAR ATLAS for the Library, the School, and the Observatory, in 12 Circular Maps. Crown 8vo, 5_s._ 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. 4to, 3_s._ net. HALF-HOURS WITH THE TELESCOPE: A Popular Guide to the Use of the Telescope as a means of Amusement and Instruction. With 7 Plates. Fcp. 8vo, 2_s._ 6_d._ THE STARS IN THEIR SEASONS: An Easy Guide to a Knowledge of the Star Groups, in 12 Large Maps. Imperial 8vo, 5_s._ THE SOUTHERN SKIES: A Plain and Easy Guide to the Constellations 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, 5_s._ STAR PRIMER: Showing the Starry Sky Week by Week, in 24 Hourly Maps. Crown 4to, 2_s._ 6_d._ ROUGH WAYS MADE SMOOTH: Familiar Essays on Scientific Subjects. Crown 8vo, 3_s._ 6_d._ OUR PLACE AMONG INFINITIES: A Series of Essays contrasting our Little Abode in Space and Time with the Infinities around us. Crown 8vo, 3_s._ 6_d._ THE EXPANSE OF HEAVEN: Essays on the Wonders of the Firmament. Crown 8vo, 3s. 6_d._ THE GREAT PYRAMID: OBSERVATORY, TOMB, AND TEMPLE. With Illustrations. Crown 8vo, 5_s._ PLEASANT WAYS IN SCIENCE. Crown 8vo, 3_s._ 6_d._ MYTHS AND MARVELS OF ASTRONOMY. Crown 8vo, 3_s._ 6_d._ NATURE STUDIES. By GRANT ALLEN, A. WILSON, T. FOSTER, E. CLODD, and R. A. PROCTOR. Crown 8vo, 3_s._ 6_d._