[ 221 ] 



fo as to extinguifh the flame of a^ an ; f 

 wax-taper ; its teft was, by Abbe*!.^ 

 Fontana's method, 1.98; 2.87 ; troyed * 



3- 8 3- 117 



60. It was then expofed to the 



fun, and examined again after a 

 quarter of an hour, and found al- 

 ready fomewhat corrected ; for its 

 teft was then 1.97 ; 2.84; 3.79. 121 



The jar was again put in the 

 open air, when, after Handing i~ 

 hour in the fun, the air was found 

 to be remarkably corrected ; for 

 now its teft was 2.01; 2.25; 3.24. 176 



The jar was again replaced in 

 the fun ; when it had been expofed 

 during three complete hours, the 

 air was fo much improved as to be 

 better than the common air at the 

 time; for its teft was 1.95 ; 2.2 1~; 

 2.20 180 



The 



