

CONTENTS. 



SECTIONPHYSICS (including Astronomy). ^ ^ 



The President, W. SPOTTISWOODE, M.A., LL.D., F.R.S. : Opening Address . . t 



W.M. HUGGINS, D.C.L., LL.D., F.R.S.: On Spectroscopy Applied to the 



Heavenly Eodies other than the Sun .. .. 



J. NORMAN LOCKYER, F.R.S 



Professor SORET, of Geneva : On a Spectroscope with a Fluorescent Ocular Glass . . 

 H. C. SORCV, F.R.S., Prcs. R.M.S. : On Spectrum Microscopes and the Measuring 



Apparatus used with them 



M. RAOULPICTET : On Ice Making Machines 



Sir W. THOMSON, LL.D., F.R.S. : The Principles of Compass Correction 



Capt. EVANS * " " ^5 



M. ELIE WAKTMANN : On Experiments with the Radiometer .. 37 



Mr, FLETCHER: On Anemometers 39 



The PRESIDENT 4r 



Professor TYNDALL, D.C.L., LL.D., F.R.S. : The Reflection of Sound .. .. 4* 



Dr. STONE: On Just Intonation 4 9 



Mr. BOSANQUET : On Instruments of Just Intonation 55 



Dr. STONE: On the Limits of Audible Sound 5 



Mr. F. GALTON, F.R.S 6l 



Mr. ALEXANDER J. ELLIS, F.R.S 64 



Professor W. G. ADAMS, M.A., F.R.S. : On the late Sir Charles Wheatstone's 



Acoustical Discoveries 



Mr. W. CHAPPELL : Ancient Musical Science 7 2 



Mr. J. BAILLIE HAMILTON : jEolian Instruments : -- 7* 



M. TKESCA : Upon Objects Illustrating the History of Science and the means of 



ensuring their conservation 



The Earl of ROSSE. D.C.L., F.R.S.: On Thermopiles .. * 



The Earl of ROSSE, D.C.L., F.R.S. : On Zullner's Astro-Photometer 9- 



Mr. DE LA RUE, D.C.L., F.R.S. : On a New Form of Eattcry 94 



Professor ANDREWS, M.A., F.R.S W 



Professor DE ECCHER : The Italian Instruments at the Exhibition of Scientific 



Apparatus < 



Professor J. CLERK-MAXWELL, M.A., F.R.S. : On the Equilibrium of Heterogeneous 



Substances .. .. * 43 



Professor ANDREWS, M.A., F.R.S. : On the Liquid and Gaseous States of Eodie . . 15 



Professor DEWAR : On the Charcoal Vacuum I5 5 



>I. SARASIN-DIODATI : Upon Auguste De La Rive's Last Researches in Electricity 157 



