- 52 - doubly refracting crystals heat in altering molecular quartz on, 47, 119 from fine particles, 95 refraction, 12 the sky, 93 tourmalin, 2, III Polarised light, circularly, 47, 69 by doubly refracting crystals, 60 Rays, convergent and divergent, phe- nomena due to, 104 — ordinary and extraordinary, 19, 74 Reflexion and refraction, Tyndall's Reflexion, polarisation of light by, 8 Refraction and reflexion, Tyndall's Refraction, double, 17 Regular system of crystals, 106 Rhombohedron of Iceland spar, 17 Right and left handed circular polari- Right and left handed quartz, 50 Saccharometer, 56 Section, intermediate and supplemen- Selenite (see also Iceland Spar), 30, 75 WHE Selenite designs for illustrating chro- Silver plate, circular polarisation of Spirals, Airy's, 119 Strain or pressure, effect of, on polar- Sugar, action of, on polarised light, Supplementary section, 75, 83 Spottiswoode & Co., Printers, New-street Square, London. POPULAR LECTURES AND ADDRESSES ON VARIOUS SUBJECTS IN PHYSICAL SCIENCE. By Sir WILLIAM THOMSON, D.C.L., LL.D., F.R.S.E., Fellow of St. Peter's College, Cambridge, and Professor of Natural Philosophy in the University of Glasgow. With Illustrations. 3 vols. Crown 8vo. Vol. I. CONSTITUTION OF MATTER. 65. ON THE ORIGIN AND METAMORPHOSES OF INSECTS. By Sir JOHN LUBBOCK, Bart., F.R.S., M.P., D.C.L., LL.D. With numerous Illustrations. Third Edition. Crown 8vo. 3s. 6d. ON BRITISH WILD FLOWERS CONSIDERED IN RELATION TO INSECTS. By Sir JOHN LUBBOCK, Bart., F.R.S., M.P., D. C. L., LL.D. With Illustrations. Fourth Edition. Crown 8vo. 4s. 6d. FLOWERS, FRUITS, AND LEAVES. By Sir JOHN LUBBOCK, F.R.S., &c. Second Edition. Crown 8vo. 4s. 6d. THE TRANSIT OF VENUS. By G. FORBES, M.A., Professor of Natural Philosophy in the Andersonian University, Glasgow. Illustrated. Crown 8vo. 3s. 6d. THE COMMON FROG. By ST. GEORGE MIVART, F.R.S., Lecturer in Comparative Anatomy at St. Mary's Hospital. With numerous Illustrations. Crown 8vo. 35. 6d. 3s. 6d. POLARISATION OF LIGHT. By W. SPOTTISWOODE, Is. 6d. SOUND: A Series of Simple, Entertaining, and Inexpensive Experiments in the Phenomena of Sound, for the Use of Students of every age. By A. M. MAYER, Professor of Physics in the Stevens Institute of Technology, &c. With numerous Illustrations. Crown 8vo. 3s. 6d. SEEING AND THINKING. By Professor W. K. CLIFFORD, F.R.S. With Diagrams. Crown 8vo. 3s. 6d. DEGENERATION. By Professor E. RAY LANKESTER, F.R.S. With Illustrations. Crown 8vo. 2s. 6d. FASHION IN DEFORMITY, as Illustrated in the Customs of Barbarous and Civilized Races. By Professor FLOWER. With Illustrations. Crown 8vo. 2s. 6d. CHARLES DARWIN. Memorial Notices reprinted from Nature. By THOMAS HENRY HUXLEY, F.R.S.; G. J. ROMANES, F.R.S.; ARCHIBALD GEIKIE, F.R.S.; and W. T. THISELTON DYER, F.R.S. With a Portrait engraved by C. H. JEENS. Crown 8vo. 2s. 6d. ON THE COLOURS OF FLOWERS. As Illustrated in the British Flora. By GRANT ALLEN. With Illustrations. Crown 8vo. 3s. 6d. THE SCIENTIFIC EVIDENCES OF ORGANIC EVOLUTION. By GEORGE J. ROMANES, M.A., LL.D., F.R.S., Zoological Secretary of the Linnean Society. 2s. 6d. A CENTURY OF ELECTRICITY. By T. C. MENDEN HALL. Crown 8vo. 4s. 6d. MACMILLAN AND CO., LONDON. |