PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



VOL. XLVLI. 



No. 288. 



CONTENTS. 



February 6, 1890. 



I. A new Theory of Colour-blindness and Colour- perception. By F. W. 



Edridge-Geeen, M.D 176 



II. Memoir on the Symmetrical Functions of the Roots of Systems of Equa- 

 tions. By Major P. A. MacMahon, Royal Artillery .... 176 



List of Presents ............ 178 



February 13, 1890. 



I. The Liquation of Gold and Platinum Alloys. By Edward Matthey, 



F.S.A., F.C.S., Associate Royal School of Mines 180 



II, On the Unit of Length of a Standard Scale by Sir George Shuck burgh, 

 appertaining to the Royal Society. By General J. T. "Walker, R.E., 

 F.R.S . 186 



III. Note on the Spectrum of the Nebula of Orion. By J. Norman Lockyer, 



F.R.S 189 



IT. Preliminary Note on Photographs of the Spectrum of the Nebula in Orion. 



By J. Norman Lockyer, F.R.S 189 



List of Presents 



189 



February 20, 1890. 



I. A comparative Study of Natural and Artificial Digestions. (Preliminary 

 Account.) By A. Sheridan Lea, Sc.D., Fellow of Gonville and Oaius 

 College, Cambridge, University Lecturer in Physiology, Cambridge 



II. On a Fermentation causing the Separation of Cystin. (Preliminary 

 Communication.) By Sheridan Del£pine, M.B., B.Sc. . 



III. Some Stages in the Development of the Brain of Clupea harengus 



Ernest W. L. Holt, Marine Laboratory, St. Andrews 



IV. A Cyanogen Reaction of Proteids. By J. Gxezda, M.D. 

 List of Presents 



For continuation of Contents see 2nd -page of Wrapper. 



By 



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 210 



Price Three Shillings and Sixpence. 

 April 30, 1890. 



