ijS Btjhop of Landaff’s Obfenatlons on 
fourth* fimilar in appearance to the water of the firfl or third 
well after it has been expofed a few hours to the air ; hence it 
is probable, that the external air has accefs to the water of the 
fecond and fourth well before it fprings up into the bafon. A 
great many authors have publifhed accounts of the quantity of 
common fait contained in a gallon of the water of the ftrongeft 
well $ they differ fomewhat from each other, fome making it 
more, others lefs, than two ounces. Thefe diverfities proceed 
either from the different care and fkill ufed in conducing the 
experiment ; or from a real difference in the quantity of fait 
with which the water is impregnated at different feafons of the 
year. The medium quantity of fait contained in a gallon falls* 
fhort of, I think, rather than exceeds two ounces. The fea 
water at Scarborough contains about twice as much fait as is 
found in the ftrongeft fulphur well at Harrogate. The fulphur 
wells at the bog are commonly faid to be fulphureous, but not 
faline. This, however, is a miftake ; they contain fait, and 
fait of the fame kind as the wells at the village. I could not 
diftinguifh the kind of fait by the method in which I had efti- 
mated the quantity contained in the fulphur wells ; I therefore 
evaporated a gallon of the water of the well in the bog which 
is near the rails, and obtained a full ounce of common fait, of 
a brownifti colour : the colour would have gone off by calci- 
nation. In what degree the medicinal powers of Harrogate- 
water depend on its fulphureous, and in what degree on its 
faline impregnation, are queftions which I meddle not with : 
I would only juft obferve on this head, that any ftrong ful- 
phureous water, fuch as that of Keddleftone in Derby (hire, or 
of Shap in Weftmoreland, which naturally contains little or 
no fea fait, may be rendered fimilar to Harrogate water, by 
diffolving in it a proper proportion of common fait. The four 
