— A A AA A A 
268 Effential and Marine, &c. Lea. VI, p 
in relating the manner of their Generation; that others alfo may have 
the opportunity of making proof hereof. 
28. $. When I made the Experiments for this and the foregöing ; 
Difourfe, not having fo good conveniency at home for making the 
Salts I ufed: I procured them all (except that of Firme, which I made ) , 
my flf ) to be purpofely prepared by Mr. John Blackstone a London 
Apothecary, who aflured me of his great care herein 5 and particularly, 
that he added no Nitre to whiten any of the Salts with, as is common- 
ly done for that of Tartar. 
I do declare, That all the Lixivial Salts f ( 
mentioned in this and the foregoing Difcourfe 
except thatof Fine, were faithfully prepa- 
red by me 
Jobn Blackstone. 
