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in relating the manner of their Geveration; that others alfo may have 
the opportunity of making proof hereof. 

28. §. When I made the Experiments for this and the foregoing 
Difcourfé, not having fo good conveniency. at home for making the 
Salts 1 ufed: I procured them all (except that of Firze, which I made 
my {elf ) 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 
mentioned in this and the foregoing Difcourfe 
except thatof Firne, were faithfully prepa- 
red by me 
John Blackstone. 

