-------------- Octavo, Third Edition, Corrected, 15_s._, _MATHEMATICAL TRACTS._ I. Lunar and Planetary Theories. II. Figure of the Earth. III. Precession and Nutation. IV. Calculus of Variations. V. Undulatory Theory of Optics, and Theory of Polarization. By GEORGE BIDDELL AIRY, M.A., F.R.S., Astronomer Royal. ------------------------------------------------------------------------ With Illustrations, 5_s._ 6_d._, LECTURES ON ASTRONOMY, Delivered at the College. By the Rev. HENRY MOSELEY, M.A., F.R.S. Professor of Astronomy and Natural Philosophy in King’s College, London. By the same Author, with Illustrations, 6_s._ 6_d._, MECHANICS APPLIED TO THE ARTS, INCLUDING STATICS AND HYDROSTATICS. -------------- With 250 Wood Cuts, Octavo, 15_s._, PRINCIPLES OF MECHANISM; Designed for the Use of Students of the Universities, and for Students of Engineering generally. By R. WILLIS, M.A., F.R.S., Jacksonian Professor of Natural and Experimental Philosophy in the University of Cambridge. ------------------------------------------------------ GERMAN BOOKS FOR LEARNERS. By ADOLPHUS BERNAYS, Phil. Doc.; Professor in King’s College, London. I. A COMPENDIOUS GRAMMAR, with a copious Appendix; including a Dictionary of Prefixes and Affixes. Fourth Edition, revised. 5_s._ II. FAMILIAR EXERCISES, with Exercises for advanced Students, Copies of German Hand-writing, and Notes. Fifth Edition. 5_s._ 6_d._ III. EXAMPLES; a Key to the Exercises. Third Edition. 3_s._ IV. READER; a Selection from the most popular Writers, with Translations and Notes. Second Edition. 5_s._ V. HISTORICAL ANTHOLOGY; a Sequel to the Reader. 7_s._ VI. POETRY FOR BEGINNERS, with Notes. 4_s._ VII. POETICAL ANTHOLOGY, with a concise History of German Poetry. Third Edition. 7_s._ LONDON: JOHN W. PARKER, WEST STRAND. ------------------------------------------------------------------------ Footnotes: ------------------------------------------------------------------------ Transcriber’s Note Hyphenation has been retained as printed. Where a word is hyphenated on a line break, the hyphen is retained or removed depending on instances elsewhere in the text. The printer provided a short list of errata for this volume. The changes indicated there have been incorporated into this text.