C 98 3 



having feen many more tried by 

 Abbe Fontana, I no longer made the 

 leafl: doubtj but. the difcovery of 

 Dr. Prieftley in judging of the ex- 

 act degree of goodnefs of any air 

 was without any exception. But, 

 as I was refolved to abftain as much 

 as poflible from all analogical con- 

 cluiionSj without they were fup- 

 ported by direct experiments, I tried 

 every air I could find, not only by 

 the nitrous teft, but alfo by the 

 flame of a candle, without, how- 

 ever, harbouring any rniftrufl in the 

 already adopted manner of examin- 

 ing the degree of goodnefs of them. 

 I had already been convinced, 

 that inflammable air was made ex- 

 ploiive in a few hours when expofed 

 in the fun with any plant, though 

 I fometimes found it, by the nitrous 

 tet, fo much corrected as to ap- 

 proach 



