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On Effects of Eetentiveness in the Magnetisation of Iron and Steel. 

 (Preliminary Notice.) By J. A. Ewing, B.Sc, F.RS.E., Professor of 

 Mechanical Engineering in tb^ diversity of Tokio 39 



On Actinometrical Observations _ ade in India at Mussooree in Autumn 

 of 1880, and Summer and Autumn of 1881. By J. B. N. Hennessey, 

 F.RS., Deputy Superintendent Great Trigonometrical Survey of India 

 (Plate 1) 45 



On the Causes of the Light Border frequently noticed in Photographs 

 just outside the Outline of a Dark Body seen against the Sky ; with 

 some Introductory Eemarks on Phosphorescence. By Professor G. G. 

 Stokes, Sec. E.S , 63 



June 8, 1882. 



Annual Meeting for the Election of Fellows 69 



List of Presents . , 69 



No. 221— June 15, 1882. 



Researches on Spectrum Photography in relation to New Methods of 

 Quantitative Chemical Analysis. By W. N. Hartley, F.RS.E., &c, 

 Professor of Chemistry, Royal College of Science, Dublin 81 



On the Reversal of the Metallic Lines as seen in Over-exposed Photo- 

 graphs of Spectra. By W. N. Hartley, F.RS.E., &c, Professor of 

 Chemistry, "Royal College of Science, Dublin 84 



Experiments on the Value of the Ohm. Part I. By R T. Glazebrook, 

 M.A., F.RS., Fellow and Assistant Lecturer of Trinity College, De- 

 monstrator at the Cavendish Laboratory, Cambridge, and J. M. Dodds, 

 B.A., Fellow of St. Peter's CoUege. Part II. . By R. T. Glazebrook, and 



E. B. Sargant, M.A., Trinity College 86 



On a Deep Sea Electrical Thermometer. By C. "William Siemens, 

 D.C.L., F.R.S 89 



On the Coxal Glands of Scorpio hitherto undescribed and corresponding 

 to the Brick-red Glands of Limulus. By E. Bay Lankester, M.A., 



F. B.S., Jodrell Professor of Zoology in University College, London .... 95 



Note on the Differences in the Position of the Ganglia of the Yentral 

 Nerve-cord in three Species of Scorpio. By E. Bay Lankester, M.A., 

 F.R.S., Jodrell Professor of Zoology in University College, London .... 101 



On the Specific Heat and Heat of Transformation of the Iodide of Silver, 

 Agl, and of the Alloys Cu 2 L.AgI, Cu 2 I 2 .2AgI, Cu 2 L.3AgI, Cu 2 I 2 .4AgI, 

 Cu 2 I 2 .12AgT, PbL.Agl. By Professor M. Bellati and Dr. R Bomanese, 



Professors in the University of Padua 104 



(I.) On a Tangential Property of Regular Hypocycloids and Epicycloids. 

 (II.) On Theorems relating to the Regular Polyhedra which are 

 analogous to those of Dr. Matthew Stewart on the Regular Polygons. 

 By Henry M. Jeffery, F.RS 105 



On the Critical Point of Mixed Gases. By Gerrard Ansdell, F.C.S 113 



