﻿CONTENTS of N° 270.— Fourth Series, 



I. On the Examination of the Bessemer Flame with Coloured 

 Glasses and with the Spectroscope. By J. M. Silliman, M.E., Adj. 

 Prof, of Metallurgy, Lafayette College, Easton, Pa page 1 



II. On the Spectra of Carbon. By W. Marshall Watts, D.Sc, 

 Physical- Science Master in the Manchester Grammar-School 12 



III. A few Experiments illustrative of Magnetism and Diamagnetism. 

 By Frederick Guthrie. (With a Plate.) 15 



IV. On the Electromotive Force on the Contact of different Metals. 

 By E. Edlund 18 



V. On the Heat Developed in the Combination of Acids and Bases. 

 — Second Memoir. By Thomas Andrews, M.D., F.R.S., Hon. 

 F.R.S.E., Vice-President of Queen's College, Belfast 29 



VI. On a curious Property of Gun-cotton. By Dr. L. Bleekrode. 39 



VII. On Solutions for depositing Copper and Brass by means of 

 Electric Force. By W. H. Walenn, F.C.S 41 



VIII. On the Probable Character of Cometary Orbits. By A. S. 

 Davis, B.A., Mathematical Master, Leeds Grammar-School 44 



IX. Note on the Zodiacal Light. By Richard A. Proctor, B.A. . . 53 



-X. On the Hypothesis of Molecular Motions in Thermodynamics. 

 By W. J. Macquorn Rankine, C.E., LL.D., F.R.SS. Lond. & Edin. 62 



XI. Proceedings of Learned Societies : — 



Royal Society : — Dr. W. J. M. Rankine on the Mathematical 



Theory of Combined Streams .' 67 



Geological Society 71-78 



XII. Intelligence and Miscellaneous Articles : — 



On the Spectrum of the Aurora Borealis, by John Browning, Esq. 79 

 Note on the use of Eye-screens in Telescopic and other Researches, 

 by Richard A. Proctor, B.A 79 



It is requested that all Communications for this Work may be addressed, 

 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Red 

 Lion Court, Fleet Street, London. 



