382 Miscellanies. 



The [bi] chloride of sulphur, for example, a very deep red-brown fluid, 

 ihe fat and essential oils ; and many saline solutions strongly colored 

 are much more diatbermous than acids, ether, alkalies, and water. 

 The chloride and carbonate of sulphur offer the easiest passage ; 

 water, of all the substances subjected to experiment, is that which re- 

 sists the most. The order ol permeability does not change with the 

 degree of heat in the radiating focus, but the differences of permea- 

 bility are lessened in proportion to the elevation of the heat of the 

 focus. The writer affirms, as he says with certainty, that the greater 

 the refractive power of a substance, the more easily does radiant cal- 

 .oric find a passage through it. 



These experiments of Melloni are in confirmation and extensioH 

 of results obtained by P. Prevost, and published by him in 1811. — 

 Hib. Univ. Avril, 1832. 



6. Oxygenated Water. — M. Thenard announces, that having 

 teen consulted by physicians, relative to the mode of preparing in an 

 easy manner, the oxygenated water which is supposed to be useful 

 in the symptoms of cholera asphyxia, he has modified the common 

 process so as to render it very simple. It is only necessary to add 

 to the hydrochloric acid used in dissolving the peroxide of barium, a 

 ■small quantity of phosphoric acid. This acid seizes the oxide of 

 manganese, and other metallic oxides which may exist in the solution, 

 and hinders them from decomposing the binoxide of hydrogen. 



When the liquor is saturated and prepared in the ordinary way, Jt 

 is sufficient to add a convenient quantity of sulphate of silver, or even 

 an excess of sulphate of protoxide of mercury, to agitate awhile and 

 filter.— TJeu. Encyc. Avril, 1832. 



7. Two chlorides of sulphur. — Thenard and Gay Lussac, made a 

 very favorable report, (June 11,) on the memoir of Dumas on this 

 subject. 



Chemists have hitherto recognized but one combination of sulphur 

 with chlorine, although the compounds of these elements present them- 

 selves under different aspects, some red and some yellow. M. Rose 

 indeed suspected that the red owed its color to an excess of chlorine, 

 but his hypothesis was supported by no fact. Dumas conceived that 

 the two kinds were distinct compounds, and to be certain of it, he 

 subjected them to a rigorous analysis, having obtained both the red 

 and the yellow chloride of a high degree of purity. He has accord- 

 ingly proved that the yellow kind is a protochloride, composed of 



