. Specification : Solid brass body tube, as illustrated, rack and pinion focusing adjustment, sliding draw tube, fitted with specially selected 3-in. diameter object-glass, an astronomical eye-piece o( any desired power, with dark glass for soUr observation. The whole mounted on a stand of entirely new design, giving universal movements. Price complete as above. £12 10s. ILLUSTRATED DESCRIPTIVE CATALOGUE AND SECOND- HAND LISTS SENT POST FREE ON REQUEST. W. WATSON & SONS, LTD. Telescope Manufacturers Wholesale and Retail and to the British and many Foreign Governments 313 High Holborn, Lon
. Specification : Solid brass body tube, as illustrated, rack and pinion focusing adjustment, sliding draw tube, fitted with specially selected 3-in. diameter object-glass, an astronomical eye-piece o( any desired power, with dark glass for soUr observation. The whole mounted on a stand of entirely new design, giving universal movements. Price complete as above. £12 10s. ILLUSTRATED DESCRIPTIVE CATALOGUE AND SECOND- HAND LISTS SENT POST FREE ON REQUEST. W. WATSON & SONS, LTD. Telescope Manufacturers Wholesale and Retail and to the British and many Foreign Governments 313 High Holborn, London, V/.C. Works: BARNET. Herts. ESTABLISHED 1837 Messrs. Longmans' List PRACTICAL PHYSICAL CHEMISTRY liv \A\ni;K I'INDLAY, ('lieniisliy. ^nivLâ¢r^it\' of Aberdeen. Fourth Edition, Revised and Enlarged. Witli 115 Sio. Profes of TEXTBOOK OF INORGANIC CHEMISTRY Hy (.. .S. Nkwui, New and Enlarged Edition. \\ ith numerous Diagrams. Cii.)V\n S\o. 8». A TREATISE ON LIGHT Hv R. A. Willi 32S 12i. 6d. net. ELECTRICITY AND MAGNETISM FOR ADVANCED STUDENTS I!y S. (.;. SiAKLiNG, , .\., ..t the Departmeiu of Physics in the West Ham Municipal College. With Dia.;rains. Crown 8vo. 12s. 6J. net. PRACTICAL PLANT BIOLOGY. A Course of Elementary Lectures on the General Morphology and Physiology of Plants. lly Hknry II. Dixon, , With Diat^iams. Crown 8vo. 63. A SCHOOL FLORA I'or the use ol Klenuntary Botanical Classes. By W. Makshali, Watts, , , late Physical .Science Master in the Giggleswick Grammar School. With 205 Illustrations. Crown 8vo. 45. 6d. LONGMANS, CREEN & CO., 39 PATERNOSTER ROW : LONDON, E, : From Edward Arnold & Go.'s List JUST PUBLISHhl) FOUNDERS OF OCEANOGRAPHY AND THEIR WORK An Introduction to the Science of the Sea By SIR WILLIAM , , , etc. Emeritus Professor of Natural History in tlie University of
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