CONTENTS OF N° 281.— Fourth Set >es. 



XL. On the Application of a Mechanical Equation advanced by me 

 to the Motion of a Material Point round a fixed Centre of Attraction, 

 and of two Material Points about each other. By R. Clausius page 321 



XLI. On Canon Moseley's views upon Glacier-motion. By Wil- 

 liam Mathews, President of the Alpine Club 332 



XLII. On the Effect of small Variations of Temperature on Steel 

 Magnets. By J. E. H. Gordon and Willliam Newall, lately Stu- 

 dents in the Laboratories of King's College, London 335 



XLIII. On the Theory of Exchanges. By Henry Hudson, M.D. 341 



XLIV. On a New Steam-gauge. By Professor Ch. V. Zenger . . 344 



XLV. On the steady Flow of a Liquid. By Henry Moseley,M.A., 

 D.C.L., Canon of Bristol, F.R.S., Corresponding Member of the In- 

 stitute of France, &c 349 



XLVI. Hydrokinetic Solutions and Observations. By Sir Wil- 

 liam Thomson, F.R.S , 362 



Parts I. & II. On the Motion of Free Solids through a Liquid. . 362 

 Parts III. & IV. The Influence of Wind on Waves in water 



supposed frictionless 368 



Part V. Waves under motive power of Gravity and Cohesion 



jointly, without wind 374 



XLVI I. Preliminary Catalogue of the Bright Lines in the Spectrum 

 of the Chromosphere. By C. A. Young, Ph.D., Professor of Astro- 

 nomy in Dartmouth College 377 



XL VIII. Notices respecting New Books : — Explanatory Mensura- 

 tion for the use of Schools. By the Rev. Alfred Hiley, M.A 381 



XLIX. Proceedings of Learned Societies : — 



Royal Society : — Messrs. H, E. Roscoe and T. E, Thorpe on 



the Measurement of the Chemical Intensity of Total Daylight 



made at Catania during the Total Eclipse of December 22,1870. 382 



Geological Society 385-389 



L. Intelligence and Miscellaneous Articles : — 



On the Transmission of Electricity in Liquids, by Dr. D.Macaluso. 389 

 On the Boiling-points of Organic Bodies, by Ludwig Beltzmann. 393 

 Observations on the Colour of Fluorescent Solutions, by Henry 



Morton, Ph.D., President of the Stevens Institute of Technology. 393 



On the Spectra of the Simple Gases, by M. A.-J. Angstrom . . 395 



On the Testimony of the Spectroscope to the truth of the Nebular 



Hypothesis, by Professor Daniel Kirkwood, of Bloomington, 



Indiana 399 



On the Solid Crust of the Earth, by ArchdeaconPratt,M.A., F.R.S. 400 



*** 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. 



