348 ESSAYS anp OBSERVATIONS 
vitrioli, oleum vitriol, or oleum tartari, p. d. 
when by themfelves, or when diluted with 
water; nor does the falt emit any fumes with 
ol. vitriol. t wmtes 
20. A glafs of this water, into ‘which 
ten gutts of o/. tart. p. d. were dropt, and 
another glafs of the fame water, turned, with 
powder of galls, to a faint violet colour;  be- 
ing‘ mixed together, produced exactly the co~ 
tour of old red port-wine. 
Experiments made on the fame Spaw Water, 
taken up October 12. 1750, after jive 
or fi x Weeks of dry Weather. | 
21. The fharp aluminous tafte was much 
weaker, and the chalybeate ftiptic tafte fearce 
to be diftinguifhed. 
22. WiTH fyrup of violets, even after 
ftanding all night, there was a little, and but 
very little, tendency to green. 
23. WitH ol.vitrioh, no effervefcence, or 
change of colour. 
24. WITH ol. tart. p. d. no effervefcence, 
but the like clouds appeared as (10), tho 
in fmaller quantity, and of a yellow colour, 
with fearce any green. 
. 25. Wits 
