60 'The Principles of Part II. 



Exp. 26. Some of it was infufed in warm 

 water. The water had a greenim colour, 

 tafled gently acid, and very aftringent. It 

 gave the fyrup of violets a pale-red colour. 

 OL tart. p. d. dropt into it made no (enfible 

 erfervefcence, but feparated fome air-bubbles, 

 difcoloured it, and precipitated a pale-red 

 powder from it. Some of this powder was 

 put into a .crucible, and kept in the fire for 

 half an hour. I could recover but little of 

 it again, and that not quite free from the 

 fubftance of the crucible j yet the magnet 

 attracted fome of its particles, and fhewed 

 that it contained iron. The liquor evapo- 

 rated gave me a tartarus vitriolatus. 



THE pure infufion did not alter its co- 

 lour much on an admixture of galls. But 

 this was no proof that the liquor did not 

 contain fait of fteel : for an acid deftroys 

 this efFecl: of the galls ; and the liquor, as 

 we have already found, contained an acid. 

 To deftroy the acid, I poured in ol. tart. 



p. d. 



