Researches on the Salts of Selenious Acid. 



119 



more water than this, which cannot be an accident; besides, their water is 

 only with difficulty and partially carried off at 100°. 



That we may be enabled to decide with certainty which view is 

 right, it seems to be necessary to examine more closely the nature of the 

 water present. This question will be most simply settled by examining 

 whether the hydrogen in the selenious hydrate, that is supposed to be pre- 

 sent in the acid salts containing water, can be replaced by other metals. 

 To try in this way to ascertain the constitution of the acid selenites, will 

 be the object of a research, to which I intend immediately to devote some 

 time, and in which consequently the double-salts of selenious acid will be 

 examined. 



