2 5 6 Anahjfis of the Air. 



when the bladder was at any time* newly 



filled, than when it was near empty. 



From thefe violent and fatal effe£te of 

 very noxious vapours on the refpiration and 

 life of animals, we may fee how the refpi- 

 ration is proportionally incommoded, when 

 the air is loaded with lefier degrees of va- 

 pours, which vapours do in fome meafure 

 clog and lower the air's elafticity ; which it 

 beft regains by having thefe vapours dis- 

 pelled by the ventilating motion of the 

 free open air, which is rendered wholefome 

 by the agitation of winds : Thus what we 

 call a clofe warm air, fuch as has been long 

 confined in a room, without having the va- 

 pours in it carried off by communicating 

 with the open air, is apt to give us more 

 or lefs uneafinefs, in proportion to the quan- 

 tity of vapours which are floating in it. 

 For which reafon the German ftoves, which 

 heat the air in a room without a free 

 admittance of frcfli air to carry off the va- 

 pours that are raifed , as alfo the modern 

 invention to convey heated air into rooms 

 thro' hot flues, feem not fo well contrived, 

 to favour a free refpiration, as our common 

 method of fires in open chimneys, which 

 4 fires 



