[ xxiv ] 



particular accident, as they had by. 

 no means been uniform; nay, had 

 even been often contradictory, as he 

 himfelf candidly owns (fee vol. L 

 p. 91, 8cc. of Pr. Prieftley's work 

 on the fubject of air, and his lafc 

 work, p. 296.); and as Mr. Sheele 

 had constantly obierved a contrary 

 effect from beans. 



Dr. Prieftley acknowledges, p. 

 299. that, by repeating (1778) 

 again his experiments, they proved: 

 to be unfavourable to his former hy- 

 pothecs. " For," fays he, " whe- 

 * ther I made the experiments with 

 " air injured by refpiration, the 

 " burning of candles, or any other 

 ^ phlogiftic procefs, it did not grow 

 " better but worfe ; and the longer 

 f* the plants continued in the air, 

 f -the more phlogiificated it was. 5 ' 

 He proceeds thus farther : " I have 



« had 



