NOVUM ORGANUM. 315 



objecti a sensu; vel per hebetationem object! per interpositio- 

 nem medii tails, quod objectum debilitet, non annihilet ; vel per 

 admissionem et exceptionem objecti reflexi, ubi percussio di- 

 recta sit nimis fortis ; ut solis in pelvi aquae. 



Septimum autem genus latitantiae, ubi sensus ita oneratur 

 objecto ut novae admission! non sit locus, non habet fere locum 

 nisi in olfactu et odoribus ; nee ad id quod agitur multum per- 

 tinet. Quare de deductionibus non-sensibilis ad sensibile, haec 

 dicta sint. 1 



Quandoque tamen deductio fit non ad sensum hominis, sed 

 ad sensum alicujus alterius animalis cujus sensus in aliquibus 

 humanum excellet : ut nonnullorum odorum, ad sensum canis ; 

 lucis, quae in acre non extrinsecus illuminate latenter existit, 

 ad sensum felis, noctuae, et hujusmodi animalium quae cernunt 

 noctu. Recte enim notavit Telesius, etiam in acre ipso inesse 

 lucem quandam originalem, licet exilem et tenuem, et maxima 

 ex parte oculis hominum aut plurimorum animalium non inser- 

 vientem ; quia ilia animalia, ad quorum sensum hujusmodi lux 

 est proportionata, cernant noctu ; id quod vel sine luce fieri, 

 vel per lucem internam, minus credibile est. 



Atque illud utique notandum est, de destitutionibus sen- 

 suum eorumque remediis hie nos tractare. Nam fallacise sen- 

 suum ad proprias inquisitiones de sensu et sensibili remittendae 

 sunt ; excepta ilia magna fallacia sensuum, nimirum quod con- 

 stituant lineas rerum 2 ex analogia hominis, et non ex analogia 

 universi ; quae non corrigitur nisi per rationem et philosophiam 

 universalem. 



XLI. 



Inter Praerogativas Instantiarum, ponemus loco decimo 

 octavo Instantias Vice, quas etiam Instantias Itineraries et 

 Instantias Articulatas appellare consuevimus. Eae sunt quse 

 indicant naturae motus gradatim continuatos. Hoc autem genus 



1 An excellent instance of the " deductio nonsensibilis ad sensibile " [in the second 

 kind] occurs in the experiments recently made by Messrs. Hopkins and Joule for de^ 

 termining the melting-point of substances subjected to great pressure. The substance 

 acted on is enclosed in a tube out of reach and sight. But a bit of magnetized steel 

 has previously been introduced into it, and is supported by it as long as it remains 

 solid. A magnetic needle is placed beside the apparatus, a certain amount of deviation 

 being, of course, produced by the steel within the tube. The moment the temperature 

 reaches the melting-point, the steel sinks ; and its doing so is indicated by the motion 

 of the needle. 



2 This phrase may, I think, be rendered " trace the outlines of outward objects." 

 I have already remarked on the meaning of " ex analogia. " [See note on Distributio 

 Operis, p. 138. /. ] 



