CONTENTS — {continued) . 



December 13, 1877. 



PAGE 



I. On Electrostriction. By Edmund J. Mills, D.Sc, F.R.S., " Young " 



Professor of Technical Chemistry in Anderson's College, Glasgow . . 504 



II. The Examination of Air. By R. Angus Smith, Ph.D., F.R.S 512 



III. On a Cause for the Appearance of Bright Lines in the Spectra of Irresolv- 



able Star- Clusters. By E. J. Stone, M.A., F.R.S., Her Majesty's 

 Astronomer, Cape of Good Hope 517 



IV. Experimental Researches on the Electric Discharge with the Chloride-of- 



Silver Battery. By Warren De La Rue, M.A., D.C.L., F.R.S., and 

 Hugo W. Muller, Ph.D., F.R.S 519 



December 20, 1877. 



I. Notes on Supersaturated Saline Solutions. By Charles Tomlinson, 



F.R.S 523 



II. Notes on Physical Geology. — No. III. On a new Method of finding Limits 

 to the Duration of certain Geological Periods. By the Rev. Samuel 

 Haughton, M.D. Dubl, D.C.L. Oxon., E.R.S., Professor of Geology in 

 the University of Dublin 53 1 



III. On certain Movements of Radiometers. By G. G. Stokes, M.A., Sec. 



R.S 546 



List of Presents 555 



Index. 563 



Obituary Notice : — 



J. B. A. L. L. Elie de Beaumont iv 



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