4o8 ESSAYS and OBSERVATIONS 



bottle I fhook frequently and ftrongly for 

 two days ; the third day I tried both, 

 with powder of galls and ol. tart* />. d. ; 

 with the galls, both gave a very deep bluej 

 but the water which had been (haken 

 with the oL tart, rather yielded a fainter 

 green, than that which had not: I let 

 both bottles fland corked up as before 

 for ten or twelve days longer, without 

 fhaking ; then tried them again with the 

 galls and o/. tart, they both ftruck much 

 the fame deep blue, though not fo deep as 

 at firfl J and, with oi. tart* the water 

 •which had not been fhaken gave a green, 

 though fainter than at firit ; the other 

 fcarce offered any green ; the clouds form- 

 ed in it were fewer, and of a lighter yel- 

 Jow, than thofe of the other. From 

 which it feems, that fhaking fomewhat 

 weakens the chalybeate principle of this 

 water, though not much nor fudden- 



Th I s water feems to belong to the clafs 

 of the aquae Martiatae ; for it effervefces 

 not with acids, like the acidulse and ther- 

 mae ; neither is its volatile iron principle 



fa 



