Presents. 



[Mar. 6, 



method was first employed, in which ice, and water cooled "below its 

 freezing-point were simultaneously subjected to the same pressure, 

 which could be varied at will, and the differences of temperature 

 noted. 



Another series of observations had reference to the vapour-pressures 

 of ice alone, at temperatures ranging from 0° to —16°. The numbers 

 obtained, when represented graphically, proved not to be identical 

 with those calculated by means of Regnault's formulas D and E : 

 accepting formula D, which represents the vapour-pressures of steam 

 in contact with water, as correct, owing to the greater number of 

 observations and the greater range of temperature over which they 

 extend, the ice-steam curve was recalculated by the method given by 

 Professor James Thomson, and it was found that our observations 

 agreed much more closely with this curve than with that deduced 

 from Regnault's formula E. 



In the original paper, figures and diagrams illustrating these points 

 are given. 



As these substances — camphor, benzene, acetic acid, and water — 

 are representatives of very different chemical types, it may be held to 

 be trie for all stable substances that the vapour-pressure of the solid 

 is less than that of the liquid at the same temperature, and that the 

 differences between these pressures are calculable from thermic data, 

 where these are known. 



In conclusion, attention is drawn to the new method of ascertaining 

 the vapour-pressures of solids and liquids, and a full statement of the 

 important advantages which it offers is given. 



Presents, March 6, 1884. 



Transactions. 



Cambridge (U.S.) : — Museum of Comparative Zoology at Harvard 

 College. Bulletin. Vol. XI. No. 9. 8vo. Cambridge 1883. 



The Museum. 



London : — British Pharmaceutical Conference. Year - book of 

 Pharmacy, 1883. 8vo. London 1883. The Conference. 



Society of Biblical Archaeology. Transactions. Vol. VIII. 

 Parts 1 and 2. 8vo. London 1884. The Society. 



Stockholm: — K. Svenska Vetenskaps - Akademie. Bihang till 

 Handlingar. Band VIII. Hafte 1. 8vo. Stockholm 1883-84. 



The Society. 



Journals. 



Bullettino di Bibliografia e di Storia. Agosto 1882— Aprile 1883. 

 4to. Rorria 1882-83. The Prince Boncompagni. 



