PROFESSOR TYNDALL'S AMERICAN LECTURES. 



Now ready, with Lithographic Frontispiece and 59 Diagrams, in crown 8vo, 

 cloth, price 7s. 6d. 



LECTURES ON LIGHT, 



Delivered in the United States of America in the years 1872 and 1873 j with an 



Appendix. 



By JOHN TYNDALL, LL.D., D.C.L., F.R.S., 

 Professor of Natural Philosophy in the Royal Institution of Great Britain. 



London : Longmans, Green, and Co., Paternoster Row. 



MR. PROCTOR'S NEW WORK ON THE MOON. 



In One Volume, crown 8vo, cloth, with 22 Lithographic Plates, Charts, and Dia- 

 grams, 1 Wood Engraving, and 3 Lunar Photographs by Rutherfurd, of New 

 York, price 15s. 



THE MOON; HER MOTIONS, ASPECT, SCENERY, AND PHYSICAL 



CONDITION. 



By RICHARD A. PROCTOR, B.A. Cantab., 

 Hon. Sec. R.A.S., 



Author of ' Other Worlds than Ours,' « Saturn and its System/ ' The Orbs 

 Around Us,' &c. 



London: Longmans, Green, and Co., Paternoster Row. 



Now ready, with Engravings, 8vo, 12s. 



AN INTRODUCTION TO PHYSICAL MEASUREMENTS, 



with 

 APPENDICES ON ABSOLUTE ELECTRICAL MEASUREMENT, etc. 



By Dr. F. KOHLRAUSCH. 



Translated from the Second German Edition by T. H. WALLER, B.A., B.Sc, 



and H. R. PROCTER, F.C.S. 



J. and A. Churchill, New Burlington Street. 



Now ready, price 24s. 



REPORT OF THE FORTY-SECOND MEETING OF THE BRITISH 



ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE. 



Held at BRIGHTON, 1872. 



John Murray, Albemarle Street. 





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