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Translated from and 614 Woodcuts, price 318. 6d. the German by W. S. DALLAS, F.L.S. Illus cloth. trations. Post 8vo. 6s. London: LONGMANS, GREEN, and Co. Paternoster Row. JOHN MURRAY, Albemarle Street. NEW ASTRONOMICAL WORKS BY RICHARD PROCTOR, B.A. Now ready, medium 8vo. with twelve page In ONE VOLUME, crown 8vo. with 10 Plates Woodcuts and Plans, price 21s. (7 coloured) and 107 Figures engraved on Wood, price 14s. cloth, THE SCHOOLS FOR THE PEOPLE. THE SUN; RULER, LIGHT, FIRE. 1 Containing the History, Development, and 1 and LIFE of the PLANETARY present working of each description of English SYSTEM. By RICHARD A. PROCTOR, B.A. School for the Industrial and Poorer Classes. F.R.A.S. By GBORGE C. T. BARTLEY, Examiner Science and Art Department, Author of The One The primary object | and their importance of Mr. PROCTOR is to re- in assisting us to increase Square Mile in the East of London,' &c. cord the remarkable dis our stock of knowledge. 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It is believed that it will be found a OTHER WORLDS THAN OURS: most useful volume to those who are actively the Plurality of Worlds studied under engaged in the extension of education, as giving the Light of Recent Scientific Researches, in a compact form much valuable information Second Edition, revised and enlarged ; with not accessible elsewhere. 14 Illustrations. BELL & DALDY, York Street, London : LONGMANS, GREEN, and co. Covent Garden. Paternoster Row. welcome to the astrono DRY AND 12 IMMERSION OBJECTIVE, (COMPLETE IN BOX) £5 : 10 : 0 CHAS. COLLINS, Microscope Manufacturer, 157C GREAT PORTLAND STREET, W. (Corner of Weymouth Street.) Catalogues of Microscopes, Apparatus, Specimens, fc., per post on application. HENRY CROUCH, 51 London Wall, London, E.C. REVISED PRICE LIST OF OBJECTIVES. 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Perfected and Exhibited in the Great Exhibitions, 1851 & 1862, Price of a Single Truss, 168., 21s., 26s. 6d., and 318. 6d.-Postage, 1s. Price of Umbilical Truss, 428. and 52s. 6d.-Postage, ls. 10d. NEW PATENT Price 4s. 6d., 78. 6d., 10s., and 16s. each.-Postage, 6d SCHOOL OF CHEMISTRY. 20 Great Marlborough Street, Regent Street. DIRECTED BY ARTHUR VACHER, F.C.S. FORMERLY JUNIOR DEMONSTRATOR OF CHEMISTRY IN THE ROYAL SCHOOL OF MINES. The LABORATORIES are furnished with every requisite for the study of the Science. The Hours are from Ten to Five, except on Saturdays, when the Laboratory closes at One. The charge is £5 per Month, or £3 for Half-time. There are no extra expenses, Chemicals, Apparatus, &c., being provided. Students work independently of each other, and can enter at any time. Demy 4to. cloth, price 58. HALF - HOURS WITH THE STARS. A PLAIN AND EASY GUIDE TO THE KNOWLEDGE OF THE CONSTELLATIONS. 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