426 ZINC, CADMIUM, LEAD, &c. 



Mercury 251 ,. ., 



> constituting an atom perchloride. 

 Chlorine 9 / 



34 



It is clear, therefore, that 27 peroxide of mer- 



cury could not oecome 34 corrosive sublimate, 



Atom of unless the atomic weight of mercury were 25, 



mercury. 



and unless peroxide of mercury were composed 

 of 1 atom mercury and 2 atoms oxygen. 



3. The analysis of calomel by Chenevix is so 

 conclusive, that I did not consider it at first as 

 worth while to make any researches on the sub- 

 ject. But it may be satisfactory to mention the 

 Atom of following experiment, which was made with an- 

 other object in view. A quantity of crystallized 

 protonitrate of mercury, which I knew to contain 

 precisely 25 grains of mercury, was dissolved in 

 water, and the solution mixed with a solution of 

 7*5 grains of decrepitated common salt : calo- 

 mel precipitated, which, when collected on a 

 double filter, washed and dried, weighed 29*5 

 grains j and the residual liquid being examined 

 for mercury and muriatic acid, no traces of either 

 could be detected. From this experiment it is 

 obvious, that calomel is a compound of 



1 atom mercury . 25 



1 atom chlorine . 4-5 



of 



caref ul analysis of cinnabar gave evi- 



