CHLORINE AND IODINE. 



black oxide are equivalent to 4 grains of metal- 

 lic copper. So that the chloride was a com- 

 pound of 



Copper 4 



Chlorine 4' 5 



4*5 is evidently one atom of chlorine, and 4 

 one atom of copper. In this chloride one atom 

 of copper is united with one atom of chlo- 

 rine. 



Thus it appears, that an atom of chlorine 

 unites with either one atom or two atoms of 

 copper; and that an atom of chlorine weighs 

 exactly 4*5. 



rideofmer- % Jt wil1 be shown hereafter, that an atom of 

 cur y> mercury weighs &5. Now, mercury, like copper, 

 combines with two proportions of chlorine, for- 

 ming a protochloride, usually called calomel, 

 and a deutochloride, usually called corrosive 

 sublimate. 



Calomel is composed of 



Mercury 25 

 Chlorine 4-5 



29-5 



and corrosive sublimate of 



Mercury 25 

 Chlorine 9 



34* 



* See Annals of Philosophy, (second series) II. 127. 

 9 



