Springs at Lemington Priors. 205 
turated. But most. commonly the muriatic acid 
does not dissolve it at all. Further, it has’ been 
said above (vit. 1.) that the acids precipitate a cry- 
stalline substance from oxygenated muriat of iron. 
This substance I have found.to contain manganese. 
But what belongs to this place to observe is, that it 
is not always, indeed it is but rarely that this effect 
can be produced in any great degree; in a very 
small degree it may be always observed, but when I 
first remarked it, the precipitate was very copious, 
so that enough was readily collected for examina- 
tion by the blowpipe. The salt of manganese does 
not shew this appearance in the smallest degree. It 
depends, therefore, on some peculiarity of the iron 
rust, but precisely on what I cannot undertake to 
determine. 
As the Sesto tk salts unite with all the other 
salts of the water, and consequently cannot be sepa- 
rated by spirit of wine, I have found it impossible 
to determine the quantity of them. 
I had myself concluded from the experiment (1.) 
that this water contained muriat of lime; and the 
following remark confirmed me in my error: I 
mention it, as*I think it probable that others have 
_ been led into mistakes from the same cause. I re- 
duced some of the water, by evaporation, to about, 
two ounce-measures; taking for granted that, by 
this process, nearly the whole of the sulphat of lime 
was separated. By adding sulphuric acid to this li- 
