258 NOVUM ORGANUM. 



illas et determinationes actus puri, quae naturam aliquam sim- 

 plicem ordinant et constituunt ; ut calorem, lumen, pondus ; in 

 omnimoda materia et subjecto susceptibili. Itaque eadem res 

 est Forma Calidi aut Forma Luminis, et Lex Calidi sive Lex 

 Luminis ; neque vero a rebus ipsis et parte operativa unquam 

 nos abstrahimus aut receclimus. Quare cum dicimus (exempli 

 gratia) in inquisitione Formae Caloris, rejice tenuitatem, aut 

 tenuitas non est ex Forma Caloris, idem est ac si dicamus potest 

 homo superinducere calorem in corpus densum ; aut contra, potest 

 homo auferre aut arcere calorem a corpore tenui. 



Quod si cuiquam videantur etiam Formae nostrae habere 

 nonnihil abstracti, quod misceant et conjungant heterogenea 

 (videntur enim valde esse heterogenea calor crelestium et ignis : 

 rubor fixus in rosa aut similibus, et apparens in iride aut 

 radiis opalii aut adamantis"; mors ex summersione, ex crema- 

 tione, ex punctura gladii, ex apoplexia, ex atrophia ; et tamen 

 conveniunt ista in natura calidi, ruboris, mortis), is se habere 

 intellectum norit consuetudine et integralitate rerum et opi- 

 nionibus captum et detentum. 1 Certissimum enim est ista, 

 utcunque heterogenea et aliena, coire in Formam sive Legem 

 earn quae ordinat calorem aut ruborem aut mortem; nee 

 emancipari posse potentiam humanam et liberari a naturae 

 cursu communi, et expandi et exaltari act efficientia nova et 

 modos operandi novos, nisi per revelationem et inventionem 

 hujusmodi Formarum ; et tamen post istam unionem naturae, 

 quae est res maxime principalis, de naturae divisionibus et 

 venis, tarn ordinariis quam interioribus et verioribus, suo loco 

 postea dicetur. 



XVIII. 



Jam vero proponendum est exemplum Exclusionis sive Ke- 

 jectionis naturarum, quae per Tabulas Comparentiae reperiuntur 

 non esse ex Forma Calidi ; illud interim monendo, non solum 

 sufficere singulas tabulas ad Rejectionem alicujus naturae, sed 



1 The objection here anticipated has actually been made. It has been said that 

 we cannot be sure that any quality always proceeds from the same cause. And in 

 truth, though the axiom " like causes produce like effects," and vice versa, seems to be 

 inseparable from the idea of causation, yet the force of the objection remains. For 

 the reference of sensible qualities to outward objects involves a subjective element. 

 The same colour, as referred to a substance as the object in which it resides, is a dif- 

 ferent thing as it is a fixed colour, or prismatic, or epipolar, &c. They agree, it may 

 be said, in the type of undulation ; but viewed as properties of bodies, or with re- 

 ference to operations on them, they are distinct. And if we could go further into the 

 mechanism of sensation, we should probably recede further both from concrete bodies 

 and from practice. 



fi 



