Ere Yo 
Springs at Lemington Priors. 1814 
pipe upon charcoal. It consists, therefore, of oxyd 
of iron, either totally or in part; but whether it is 
derived from the liquor, or from the iron which was 
used to procure it, cannot be determined by this 
experiment. But the following observation de- 
monstrates, that iron is contained in the water its- 
self. 3. The water was boiled in a copper vessel, 
and the precipitate formed was collected. This is 
also of a yellow colour: and, exposed to the flame 
of a blowpipe on charcoal, (like the former precipi- 
tate) it became magnetic. It seems also to contain 
copper; for, precipitating its solution in muriatic 
acid by ammoniac, the liquor became blue; the co- 
lour, however, was by no means strong. 
When the salts of the water have been con- 
centrated by evaporation, copper is acted upon 
more powerfully; insomuch, that if a silver spoon 
be used for the evaporation, it is much tarnished, 
and the salts acquire a cupreous taste and a yellow 
tinge, though they are colourless if the evaporation 
be made in glass. These vestiges of copper must 
be attributed to the alloy of the spoon. 
The appearances I have described surprised me » 
the more, as, from the use of some of the common 
re-agents, I had formed opposite conclusions. 4. 
Prussiat of potash, before the water has been boiled, _ 
forms a green cloud; but ina quantity hardly suffi- 
cient to precipitate. After boiling, there is no de- 
composition; nor is there any if the liquor be eva- 
