vi 



The following Papers were read : — 



I. "Coefficients of the Cubical Expansion of Ice, Hydrated Salts, 

 Solid Carbonic Acid, and other Substances at Low Tempera- 

 tures." By Professor James Dewar, F.R.S. 



II. " The Conditions determinative of Chemical Change and of 

 Electrical Conduction in Gases, and of the Phenomena of 

 Luminosity." By Professor H. E. Armstrong, F.R.S. 



III. " Contributions to a Theory of the Capillary Electrometer." — 



I. The Insulation-Resistance of the Capillary Electrometer, 

 and the Minimum Quantity of Electricity required to produce 

 a Visible Excursion." By G. J. Burch, F.R.S. 



IV. " The Development of Echinus esculentus, together with some Points 



in the Development of E. miliaris and E. acutus." By Pro- 

 fessor E. W. MacBride. Communicated by A. Sedgwick, 

 F.R.S* 



* The short paper read November 28, 1901, and printed p. 268 of preeeding 

 Tolume, is to be considered as an abstract of this paper. 



