CENTURY IX. 455 



applied unto the instruments and uses which men 

 ordinarily practise ; but they are all but the effects 

 of some of these causes following, which we will 

 enumerate without applying them, because that will 

 be too long. The first is the cession, or not cession 

 of bodies, into a smaller space or room, keeping the 

 outward bulk, and not flying up. The second is the 

 stronger or weaker appetite in bodies to continuity, 

 and to fly discontinuity. The third is the disposi 

 tion of bodies to contract, or not contract : and 

 again, to extend, or not extend. The fourth is the 

 small quantity, or great quantity of the pneumatical 

 in bodies. The fifth is the nature of the pneumati 

 cal, whether it be native spirit of the body, or com 

 mon air. The sixth is the nature of the native 

 spirits in the body, whether they be active and 

 eager, or dull and gentle. The seventh is the emis 

 sion, or detention of the spirits in bodies. The 

 eighth is the dilatation, or contraction of the spirits 

 in bodies, while they are detained. The ninth is 

 the collocation of the spirits in bodies, whether the 

 collocation be equal, or unequal ; and again, whether 

 the spirits be coacervate, or diffused. The tenth is 

 the density, or rarity of the tangible parts. The 

 eleventh is the equality, or inequality of the tangible 

 parts. The twelfth is the digestion, or crudity of the 

 tangible parts. The thirteenth is the nature of the 

 matter, whether sulphureous or mercurial, watery or 

 oily, dry and terrestrial, or moist and liquid ; which 

 natures of sulphureous and mercurial, seem to be na 

 tures radical and principal. The fourteenth is the 



