Intelligence and Miscellanies. 391 



Foreign Extracts, by Prof. J. Griscqm. 



23. Chloride of Lime. — A memoir on this substance, read 

 before the Philosophical Society of Geneva, by A, Morin, 

 furnishes several interesting details, among which are the 

 following. 



The action of heat upon the dry chloride, has been exam- 

 ined by several chemists, and among others, by Welter and 

 Ure. M. Welter expelled from the chloride, a quantity of 

 oxygen, equal to that of the chlorine which had combined 

 with the hydrate of lime. Dr. Ure obtained by the applica- 

 tion of heat, at first chlorine, then euchlorine, and finally 

 oxygen, but in variable quantities. In repeating these ex- 

 permients on chlorides made at different temperatures, cold 

 and hot, I have, in some cases, obtained oxygen without 

 any sensible mixture of chlorine, and in the same quantity 

 from the two chlorides. At other times, I have obtained 

 chlorine and oxygen in the same order as Mr. Ure, but with- 

 out being able to affirm whether this gas was mixed or not, 

 with euchlorine. 



1 have remarked that in applying a very mild heat to the 

 chloride, we may obtain at first a notable volume of chlorine, 

 and that by heating it rapidly, oxygen is immediately obtain- 

 ed, mixed with a very small portion of chlorine. It is very 

 difficult to introduce any great precision in these experi- 

 ments. 



With respect to the liquid chloride — 



When water acts upon dry chloride of lime, a portion of 

 lime is separated, which may be left in contact with the fluid, 

 or abstracted by filtration. 



If a matrass, furnished with a tube, &c. for collecting gas, 

 be filled with this fluid, some bubbles of air will immediately 

 collect at the top of the glass. If it be heated, the produc- 

 tion of them will be accelerated, some of the fluid will be 

 driven into the receiver, and the gas will rapidly rise to the 

 top. 



As soon as it boils, the disengagement of gas becomes 

 rapid, and Continues with the same intensity about half an 

 hour, then diminishes, and after some hours nearly ceases. 



The gas is pure oxygen. If, instead of entirely filling the 

 glass with the fluid, we leave at the top a space filled with 

 air, and apply heat, the liquid remains, and we may estimate 

 very exactly, the volume of oxygen which this quantity of 



