*DI A TrMlfc ^/BODIES. Chap. \ 3. 



lorg it appeared by what we have faid, i: muft needs be more 

 \Ycig!uv;fincc part of the fifing water in the funk arm of che fy- 

 phonJscounterpoHed by as much defcending water intheciftern 

 And thus it is evident, that ont of this experiment it cannot 

 be inferred that parts of water do not weigh within the orb of 

 their own v? hoi? : but onely, that two eqaall parts of water in 

 rhcir own orb ( namely that which rifeth in the funken arm, 

 & that which preifeth down from the whole bulk in theciftern) 

 areo r equall weight and do ballance one another. So that never 

 To little oddes between the two cotmterpoyfing parcels of water 

 which are in the aire muft needs make the water run out at that 

 end of the fyphon, where the overweight of water is. 



The attrailion whofe caufc next to this i$ moft manifcft, is 



that which is made by the force of heat or of fire;for we fee that 



Concerning fire ever draweth aire unto itjfb notably.,that if in a clofe room 



actr r jT c there be a good fire, a man that ftandeth at the door or at the 



caul.d bynrO- .> , _ .. \nni /- i ft 



window ( especially without) lhall near men a noile that he 

 will think there is a great wind within the chamber. The reafort 

 of this attraction is, that fire ratifying the aire which is next 

 unto itj and withall fpending it fclfperpetaallyjcaufeth the aire, 

 and his own body mingled together,to flic up through the chim- 

 ney or by fome other paflage. Whence it folio weth of neeeflity 

 that the next body muft fuccced into the pkce of the body that i$ 

 flown away. This next body generally is aire, whofe mobility 

 and fluidity beyond all other bodies, makerh it of all others the 

 fittcft to be drawn; and the more of it that is drawn the more 

 muft needs follow. Now if there be floting in this aire any 

 other atomes fubje& to the current which the aire taketh; they 

 muft alfo come with it to the fire, and by it, muft be ratified, 

 and be exported out of that little orb. 



Hence it is, that men ( with very good reafbn ) do hold that 

 fire aireth a chamber, as we terme ic, that is, purifieth it, both 

 becaufe it purifieth it as wind doih by drawing a current of aire 

 into it that fweepeth through it, or by making it purifie it felf 

 by motion, as a ftream of water doth by running; as alfo, be- 

 caufc thofc vapours which approach the fire,are burned and dif- 

 folved.So that the aire being noifome and unwholefome by rea- 

 fon of its grofleneflc , proceeding from its landing unmoved 

 ( like a ftagnation of dead water, in a marifti place) the fire ta- 

 keth away that caufe of annoyance. By 



