On Mineral Waters . 
477 
£tir, and the green vitriol or sulphat of iron gradually formed 
by the oxygenation of the sulphur is washed off, and crys- 
tallized. Where sulphuric acid thus formed acts upon sulpnu- 
retted iron, sulpheretted hydrogen will be produced, and es- 
cape through any sinus or aperture in the earth, where there 
is room for it, whether in contact with water or not. Where 
there is no stream but moisture only, pyrites will become hot, if 
air can get to a body of it, and that heat may be communicated 
to the earth and the capillary streams in the vicinity of it, form- 
ing the warm waters, of Bath, Mrtlock and Buxton, of England, 
and the warm springs of Virginia. 
In point of situation for salubrity of air, I know of no water- 
ing place in Pennsylvania that upon the whole, equals the sul- 
phur springs in the vicinity of Carlisle, excepting the fashiona- 
ble resorts on the sea shore. 
The York sulphur springs , 1 7 miles from Carlisle, on the road to 
Baltimore through Hanover : are found in a transition country. I 
have remarked in the vicinity of the spring, much amphibolic 
rock (hornblend and quartz.) Amphibole upon the average con- 
tains about a twentieth of magnesia. 
Dr. Cutbush analysed this water a year ago : he found that al- 
cohol of galls, prussiat of potash, and succinate of ammonia 
produced no appearance of iron. 
Muriat of barytes, produced a precipitate of sulphat of ba- 
rytes. 
Lime water, shewed no trace of carbonic acid. 
Nitrat and sulphat of silver produced a muriat of silver. 
Solution of soap produced a turbidness, shewing generally the 
presence of saline matter, oxalat of potash, threw down an oxa- 
lat of lime. 
Caustic and carbonat of potash, threw down earthy matter 
soluble in muriatic acid ; that is lime and magnesia. 
Ammoniaco-phosphat of soda, threw down an ammoniaco- 
phosphat of magnesia. The qitantity of gas contained, he had 
no opportunity of examining : but there is no doubt of its being 
sulphuretted hydrogen, nearly, but not quite so strong to the smell 
or the taste, as the water of the spring within five miles of Car- 
lisle. It blackens silver like the latter water. 
Dr. Cutbush on evaporating two ounces of the water, found a 
residuum amounting in sixteen ounces or one pint, to thirty two 
grains of saline matter : this would qonsist of 20 grains of epsora 
3 P 
