Account of the Yellow- Springs. 213 



any change ; but, if let stand for some time, a very slight 

 green shade is produced, but this never becomes blue. 



EXPERIMENT VI. 



Alkohol of galls has a very apparent effect on the water 

 when first dropt into it. An amethyst colour is pro. 

 duced, which, on standing for some time, becomes much 

 darker, but it never is changed to a black, such as the 

 taste of the water would lead a person to suspect would 

 be the case. 



It is evident, therefore, from these two last experi- 

 ments, that the water contains a small quantity of iron. 

 To determine whether it was held in solution by a fixed 

 acid, or by the carbonic acid gas, I boiled the water, 

 but found that these re-agents, after this, produced no 

 change in the colour of it, and also that it had lost all its 

 chalybeate properties : which shows that, whatever mi- 

 nute quantity of iron it does contain is held in solution 

 only by the carbonic acid gas. 



EXPERIMENT VII. 



When a few drops of nitrate of silver are poured into a 

 glass of this water, scarcely any change is produced ; a 

 very slight white cloud appears in a few minutes, which 

 in the course of twenty-four hours changes to an ash-co- 

 lour. This shows that it contains but a very minute quan- 

 tity of marine acid in any state of combination, and the 

 colour of the precipitate also shows that the water neither 

 contained sulphurated hydrogen gas, nor any extractive 



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