Anahjis of the Ah. 265 



It is found by Experiments 103, 106, and 

 107, that an air greatly charged with vapours 

 lofes much of its elafticity, which is the rea- 

 fon why fubterraneous damps fuffocate ani- 

 mals, and extinguiih the flame of candles- 

 And by Experiment 106, we fee that the 

 fooner a Candle goes out, the fafter the air 

 lofes its elafticity. 



Experiment CXV. 



This put me upon attempting to find fome 

 means to qualify and rebate the deadly noxi- 

 ous quality of thefe vapours: And in order 

 to it, I put thro' the hole, in the top of the 

 air-pump receiver, (Fig. 3 2.) which contained 

 two quarts, one leg of an iron fyphon made 

 3f a gun-barrel, which reached near to the 

 bottom of the receiver: It was cemented fail 

 at z. I tied three folds of woollen cloth over 

 he orifice of the fyphon, which was in the 

 eceiver. The candle went out in lefs than 

 wo minutes, tho' I continued pumping all 

 he while, and the air pafled fo freely thro* 

 he folds of cloth into the receiver, that the 

 lercury in the gage did not rile above an 

 ich. 



When I put the other end of the fyphon 

 ito a hot iron pot, with burning Brim/lone 



S 4 in 



