Springs at Lemington Priors. 187 
salt, an ochre precipitates copiously, which is very 
soluble in acids. Copper also decomposes the salt, 
but the matter precipitated is in small quantity and 
hardly soluble in acids. 3. Prussiat of potash is 
totally unaffected by this salt: so, likewise, is tinc- 
ture of galls, when the salt is quite perfect ;* but af- 
ter iron has been digested with it, galls communicate 
a yellow tinge, or even precipitate a brownish mat- 
ter: still the prussiat of potash has no effect. These 
properties of the salt bear so strong a resemblance 
to the appearances which I have remarked in the 
water, particularly in the effects of the metals (iv. 
2 & 3.) and the failure of the re-agents (1v. 4 & 
5+), that it strongly confirmed me in the hypothesis 
I had adopted. On pursuing the experiment, how- 
ever, the analogy failed. I added, to the salt of 
iron, very minute quantities of muriat of manga- 
nese; but how small so ever was the quantity used, 
and however much it was diluted, the manganese 
was instantly detected by prussiat of potash. I was 
therefore forced to conclude, that, if oxygenated 
muriat of iron is really an ingredient of this water, 
it must be formed by a process different from that 
which I had imagined, 
* I once saw the galls forma white precipitate; but I 
suspect the oxygenated, was contaminated with some com- 
mon muriatic acid, formed by its decomposition during the 
digestion, 
