154 iESSAYS AND OBSERVATIONS 



any plenty iflues out of the fpirit of wine. 

 As the fpirit continues long to give out air, 

 fo it is long before the thermometer im- 

 merfed in it returns to the temperature of the 

 external air. But when after fome time it 

 appears ftationary, if it is then drawn up out 

 of the fpirits and fufpended in the vacuum, 

 the mercury finks very quickly eight or 

 nine degrees ; a good deal farther than it 

 would have done in the fame circumftances 

 in the air. In the fame manner as in the 

 air, the thermometer in vacuo may be 

 made to fink lower by repeated dippings 

 into the fpirit of wine : but here thefe 

 repeated dippings have not fo remarkable 

 an efFeft as in the air ; becaufe the dipping 

 cannot be fo' quickly performed, and the 

 thermometer is therefore more affefted by 

 the warmth of the fpirit. It is fometimes 

 alfo affedted by a drop of the fpirit which 

 the ball takes up along with it, and which, 

 as I fhould have obferved above, ought al- 

 ways to be taken away in the experiments 

 made in the air. This experiment with 

 fpirit of wine was often enough repeated, to 

 ^lew clearly, that the evaporation of the fpirit 



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