CHAP. IV.J INDUCTIVE AND SYLLOGISTIC INFERENCE. 203 



grow as it were immovable ; light bodies are carried so far, 

 that they begin a rotation or circular motion. 



17. Inquire the cause why vapours and effluvia are carried 

 so high as that called the middle region of the air, since the 

 matter of them is somewhat gross, and the rays of the sun 

 cease alternately by night. 



18. Inquire into the tendency of flame upwards, which is 

 the more abstruse, because flame perishes every moment, 

 unless perhaps in the midst of larger flames ; for flames 

 broken from their continuity are of small duration. 



19. Inquire into the motion and activity of heat upwards; 

 as when heat in ignited iron sooner creeps upwards than 

 downwards. And thus much by way of example of our 

 particular topical inquiry. We must, for a conclusion, admo 

 nish mankind to alter their particular topics in such manner, 

 as after some considerable progress made in the inquiry, to 

 raise topic after topic, if they desire to ascend to the pinnacle 

 of the sciences. For my own part, I attribute so much to 

 these particular topics, that I design a particular work upon 

 their use, in the more eminent and obscure subjects of nature ; 

 for we are masters of questions, though not of things. And 

 here we close the subject of invention, 



CHAPTER IV. 



The Art of Judgment divided into Induction and the Syllogism. Induo 

 tion developed in the Novum Organum. The Syllogism divided into 

 Direct and Inverse Reduction. Inverse Reduction divided into the 

 Doctrine of Analytics and Confutations. The Division of the latter 

 into Confutations of Sophisms, the Unmasking of Vulgarisms (Equi 

 vocal Terms), and the Destruction of Delusive Images or Idols. 

 Delusive Appearances divided into Idola Trihfa, Jdola Speeds, and 

 Jdola Fori. Appendix to the Art of Judgment. The Adapting the 

 Demonstration to the Nature of the Subject. 



WE come now to the art of judgment, which treats of the 

 nature of proof or demonstration. This art, as it is com 

 monly received, concludes either by induction or syllogism : 

 for enthymemes and examples are only abridgments of these 

 two. a As to judgment by induction, we need not be large 



a An enthymeme is no other than a syllogism of two propositions, the 

 iird being supplied by the mind, ag v he word itself imports. Ed. 



