Springs at Lemington Priors. 179 
III. SOME ANOMALOUS APPEARANGES WITH 
PRECIPITANTS. 
1. After the spontaneous precipitate has been 
separated, a little oxygenated muriat of mercury 
was dissolved in a glassful of the water. A white 
matter separated during the solution, and, in some 
hours collected in considerable quantity. 
2. A piece of sulphate of argill was dropped 
into a jar of the same water; presently a stratum 
of white matter was formed at the bottom of the 
jar: but this appearance is transitory; for, in the 
course of an hour or two, the precipitate is redis- 
solved and the water resumes its transparency. 
This is an appearance which I have not found no- 
ticed by writers on the subject, though I have rea- 
son to think it not uncommon. The waters of 
Astrop, near Banbury, contain carbonat_ of lime, 
dissolved by carbonic acid: and, when the carbonat 
has been separated, by boiling the water, the same 
appearance is produced by sulphate of argill. Its 
origin, and that of the decomposition of the mercu- 
rial salt, will be shewn in the sequel. t 
IV. THE METALLIC SALTS. 
Several phenomena demonstrate the existence of 
‘some metallic substance in this water, besides the 
precipitate already described (11.): butit is so pecu- 
liarly combined, or otherwise modified, as to clude, 
