434 D r - Priestley’s "Experiments relating to Pblogifton , &c. 
than Mr. cavendish’s experiment on finding water on the 
decompofition of air. 
I cannot conclude this account without acknowledging my 
obligation to Mr. Parker for the ufe of his incomparable lens, 
and his obligingly affifting me in the management of it. Indeed, 
without this very inflrument, or one of greater power than my 
own, 1 do not know that the lafl mentioned experiments could 
have been made at all ; certainly not to fo much fatisfa&ion. 
