[ 210 ] 



one of nitrous air 1.77 ; and that 

 of the hyofcyamus 1.83. 



44. 1 placed a very lively chicken, 

 eight days old, under a jar contain- 

 ing a quart full of the air fouled by 

 the hyofcyamus plant in the preced- 

 ing experiment ; it directly grew 

 lick, and was ready to expire in lefs 

 than half a minute. I took it im- 

 mediately out of the jar, and put 

 it directly in another jar full of de- 

 phlogifticated air drawn from the 

 leaves of plants. The creature re- 

 mained for fome minutes quite mo- 

 tionlefs, fhewing no iigns of life 

 but by drawing languidly its breath ; 

 it recovered gradually in this air in 

 fix or feven minutes fo much that. 

 it began to fland upon its legs and 

 to jelp now and then with a very 

 weak voice. I then took it out of 

 the dephlogifticated air and put it 



upon 



