‘PHYSICAL ann LOTERARY. 353 
there is a/um in this water, but only to a 
great probability: for, to be fure of it, we 
muft-fee the alum chryftallifed, which is not 
eafily done * 5 and requires, for that procefs, 
a greater quantity of faltthan I had. 
Ir may be objected, ‘that, when equal © 
quantities of this water and new milk were 
boiled together, the milk did not curdle (6.); 
therefore there can be no a/um in it. \ This 
objection is {pecious ; its validity, however, 
like that of many other things which have ve- 
ry plaufible appearances, can only be determi- 
ned from experiment: wherefore I diflolvea 
Se 
in water a greater proportion of a/wm, than 
there is, or feems to be, in this Spaw; and, 
when equal quantities of this folution, and 
frefh milk, were boiled together, the milk 
did not curdle. . 
, 6. Tuts water contains very little earth, 
Sa ee eee a ae ee eee 
it gives not the leaft fign of it, when o/. cart. 
p. d. is dropt into it; but the little it contains, 
feems to be of the white calcarious kind: 
and tho’ okry-earth is commonly allowed to 
_ be a conftituent principle in chalybeate wa- 
Yy ters, 
* Vid. Suaw’s Inquiry into Scarborovgh water, part I. 
§ 4. art. 43. 
