3o8 Dr.VKiE^rL'E.Y's Experiments and Ohfervations 

 tained the^very fame proportion of phlogiftoii with iron. Since 

 when iron that has been faturated with dephlogiflicated air is 

 heated in inflammable air (in which procefs an equal weight of 

 water is produced, and the lols of weight in the iron is equal to 

 that of fuch a quantity of dephlogiflicated air as would have 

 been one-half of the bulk of the inflammable air which difap- 

 pears in that procefs) it might have been concluded, thiit one* 

 fifth of any quantity in water had been inflammable air. 



For, negleding the difference between the weight of dephlo- 

 gifticated and common air, which is not confiderable, and eili- 

 mating the latter -^-g-5-th part of water, and inflammable air at 

 one-tenth of the weight of common air, an ounce meafure of 

 dephlogiflicated air will weigh .6 grain, and two ounce mea- 

 fures of inflammable air will weigh .12 grain, which num- 

 bers are to each other as 5 to i *. 



Though, in confequence of the fmall quantity of fixed air 

 which is found in the procefs of melting iron in dephlogifli- 

 cated air, this coiicluflon is not accurate, it is pretty nearly 

 fo ; and it is remarkable that, upon this fuppofition, about as 

 much inflammable air is expelled from iron when water is com- : 



■^' It appears from the profeCution of thefe experiments, that the water whicfe 

 is found on heating the fcales of iron in inflammable air, is not formed by the 

 dephlogiflicated air CKpelled from them uniting with the inflammable air in the 

 veflel, but was the water previoufly contained in the fcales, v.hich is made to quit , 

 its place 'by the introduclion of the phlogifton from the inflammable air ; yet that 

 water carries out with it not much lefs phlogifton than was taken in by the iron, 

 and a little more muft be allowed for that water which was neceflary to make 

 inflammable air, and which could not enter the iron when it was revived ; fo that^ 

 on the whole, the phlogifton in the water that is found after the procefs muft be 

 •very nearly the fame quantity that is imbibed by the iron, and the water is nearly 

 the fame that would have been produced, on the fuppofltion of its being made 

 from dephlogifticated air expelled from the fcales uniting with the inflammable 

 air in the veflel. 



5 ■" bined 



