dtS Dr. Priestley's Experiments and ObfervaUons 

 ill thcTc circumftances, than I perceived the air to diminifh, and 

 at the lame time the iiiiide of the veffel to grow very cloudy, 

 with particles of dew, that covered almoft the whole of it. 

 Thefe particles by degrees gathered into drops, and ran down the 

 IkIcs oi: the veflel in all places, except where it was heated by 

 tli'^ fu n- beams ; fo that it then appeared to me very evident, 

 that -water ^ with or without fixed air, was the produce of the 

 inflammable air, and t!ie pure air let loofe from the iron in this 

 ijvGxle -of operation,.; though afterwards I was taught by Mr. 

 Watt to correct this hypothefis, and to account for this refult 

 i^i a different manner. When I had examined the remaining 

 air, it was as inflammable as ever, without containing any 

 mixture. of fixed air at all. 



When I colleded the water which wms produced in this ex- 

 periment by means of a piece of filtering paper, carefully in- 

 troduced to abforb it, I found it to be, as nearly as poflible, of 

 the fame weight with that which had been loll: by the iron : 

 and alio, in every experiment of this kind, in which 1 attended 

 to this circumflance, I found that the quantity of inflammable 

 air which had difappeared was about double to that of the de- 

 phlogifticated air fet loofe from the iron, fuppohng..that weight 

 to have been reduced into air. Thus at one .time! made a piece 

 of this flagambibe ,5! ounce meafures of inflammable air, while 

 it lofl as much as^the weight of about 3 ounce meafure-s of de- 

 phlogifticated air, and the water colledted weighed 2 grains. 

 Another time a piece of flag lofl: 1.5 grains, .and the water 

 produced was 1.7 grains; but per fed accuracy is not to be ex- 

 pected. ,1 fliall only mention one more experiment of this 

 kind, in which t\ ounce mealures .of inflammable air were 

 reduced to .92 ounce meafiire, and the iron had lofl: 2 grains,, 

 xqual in weight to 3.3 ounce meafures of dephlogiilicated air. 



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