the Sulphur Wells at Harrogate# iyy 
it is diffolved, preferves them from being frozen in the coldeft 
feafons incident to our climate. 
As the temperature of thefe four wells is not the fame in 
all of them at the fame time, nor invariable in any of them, 
fo neither does there feem to be any uniformity or conftancy 
in them, with refpedt to the quantity of fait which they con- 
tain. The fait with which they are all impregnated is of the 
fame kind in all, and it is almoft wholly common fait ; and 
though the quantity contained in a definite portion of any one 
of the wells is not, I think, precifely the fame at all feafons of 
the year, yet the limits within which it varies are not, I ap« 
prehend, very great. A method is mentioned in the LXth 
volume of the Philofophical Tranfadtions, of eftimating the 
quantity of common fait diffolved in water, by taking the fpe- 
cific gravity of the water: this method is not to be relied on, 
when any confiderable portion of any other kind of fait is dif- 
folved along with the fea fait ; but it is accurate enough to 
give a good notion of the quantity contained in the different 
wells at Harrogate. On the 13th of Auguft, after feveral 
days of rainy weather, I took the fpecific gravities of the four 
fulphur wells at the village, the drinking well being the firft. — 
Rain water 1.000; fir ft well 1.009; fecond well 1.002; third 
well 1.007; fourth well 1.002. By comparing thefe fpecific gra- 
vities with the table which is given in the LXth volume of the 
Tranfadtions, it may be gathered, that the water of the firft well 
contained T h- of its weight of common fait; that of thefecond 
and fourth, and that of the third, t t t . After four days 
more heavy rain I tried the ftrongeft well again, and found its 
fpecific gravity to be 1.008. It is worthy of obfervation, that 
the water, as it fprings into the firft and third well, is quite 
tranfparent, but ufually of a pearl colour in the fecond and 
Vol. LXXVI. A a fourth. 
