484- Intelligence and Miscellaneous Articles. 



"b 



atoms, and 15 volumes of oxygen, the calculated density would be 

 44'*489 or 10 X 4'*489. Tliis residt agrees well with the experiments, 

 when it is considered that in this compound 23 volumes are con- 

 densed into 10. Each atom of the compound corresponds to 10 

 volumes of vapour. 



M. Walter has proposed to consider the chromate of chloride of 

 chromium as a chromic acid, in which an atom of oxygen is replaced 

 by an equivalent of chlorine. If this view be applied to the sulphate 

 of chloride of sulphur, it would also be a sulphuric acid, in which 

 half an atom of oxygen is replaced by half a double atom of chlo- 

 rine. In this case the compound would contain i a volume of sul- 

 phur, 1 volume of chlorine, and 2^ volumes of oxygen, and the 

 calculated density of its vapour would be T'^l^. In this case a very 

 peculiar condensation must be supposed to occur, and yet the num- 

 bers would not agree with the experiment ; from which it must be 

 concluded, that the sulphate of chloride of sulphur, as it has hitherto 

 been termed, is a compound of sulphate and of a chloride of sulphur 

 which has not yet been isolated. 



The sulphate of chloride of sulphur may be prepared by a much 

 more simple process than that hitherto employed ; it is effected by 

 mixing chloride of sulphur with good Nordhausen sulphuric acid, 

 and submitting the mixture to distillation with a gentle heat. It is 

 thus obtained, mixed with hydrated sulphuric acid, from which it 

 may be separated by a fresh distillation. 



When a large quantity of anhydrous sulphuric acid is conveyed 

 into a small quantity of chloride of sulphur, a blue compound is 

 obtained. As it is very probable that chloride of sulphur is a 

 solution of sulphur in a chloride of sulphur S Cl^ not yet isolated, 

 the blue colour may be derived from the combination of this dis- 

 solved sulphur, it being well known that sulphur gives a blue solu- 

 tion with an excess of anhydrous sulphuric acid. — L'Institut, Aodt 

 1839. 



ARSENIURETTED AND SUBARSENIURETTED CHLORIDE OF 

 MERCURY. 



M. Capitaine prepares these compounds by mixing three parts of 

 calomel and one part of arsenic and heating the mixture in a matrass, 

 on a sand heat. In the bottom of the vessel a reddish yellow hard 

 mass is formed, which is not volatile, and which contains globules of 

 mercury. 



In the upper part of the matrass there is found a hard compact 

 substance, sometimes yellow or reddish yellow, and on this occur 

 dendritic crystals, which are small, opaque, of a fawn colour with 

 a greyish tint ; or larger crystals of a hyacinthine colour, which 

 are sometimes short and curvilinear, and sometimes elongated and 

 covered with crystalline concretions, the form of which is either the 

 perfect tetrahedron, or the tetrahedron truncated on the solid 

 angles. 



The compact substance is variable in its colour, and is of un- 

 certain composition. The yellowish dendritic crystals wei'e found 

 to consist of 



