NOVUM ORGANUM. 325 



xix. In the process of Exclusion are laid the foundations of true 

 Induction^ which, however, is not perfected until it rest in the 

 affirmative. Nor is the Exclusive Part itself in any way complete, 

 nor can it be so in the beginning ; for the Exclusive Part is evidently 

 a Rejection of simple Natures. But if we have not as yet good and 

 true conceptions of simple Nature, how can the process of Exclusion 

 be made correctly ? Now, some of the above-mentioned notions (as 

 that of elementary Nature, of heavenly Nature, of Rarity) are vague 

 and badly defined. And so we, being neither ignorant nor forgetful 

 how great a work we are attempting (viz. that of rendering the human 

 understanding a match for things and Nature), by no means rest con 

 tented with what we have already enjoined ; but proceed further to 

 contrive and supply stronger aids for the use of the Understanding ; 

 which we will now subjoin. And, certainly, in the Interpretation of 

 Nature the Mind should by all means be so prepared and formed, as 

 both to sustain itself in the proper degrees of certainty, and yet 

 remember (especially in the beginning) that what it has before it 

 depends very much on what remains behind. 



xx. But yet, since truth emerges more quickly from error than from 

 confusion, we think it expedient that the Understanding should be 

 allowed, when the Three Tables of First Presentation (such as we 

 have laid down) have been made and weighed, to address itself to the 

 work of Interpreting Nature in the affirmative, by the aid both of the 

 Instances given in the Tables and of those which occur elsewhere. 

 And this kind of attempt we usually call The Permission of the 

 Intellect, or The Commencement of Interpretation, or The First 

 \ intake. 



First Vintage of the Form of Heat. 



It must be observed that the Form of a thing ( as is clear from what 

 has been said) exists in each and all the Instances in which the thing 

 itself exists, for otherwise it would be no Form ; and so, evidently, no 

 contradictory Instance can be allowed. And yet the Form is found 

 to be far more conspicuous and evident in some Instances than in 

 others ; in those, namely, wherein the Nature of the Form is less 

 coerced and hindered and reduced to order by means of other 

 Natures. And Instances of this kind we usually call Glaring, or 

 Ostensive Instances. And thus we must proceed to the First Vintage 

 of the Form of Heat. 



From these Instances, viewed altogether and individually, the 

 Nature, of which heat is the limitation, seems to be Motion. Now, 

 this is displayed most of all in flame, which is in perpetual motion, 

 and in hot and boiling liquids, which also are always in motion. And 

 it is displayed again in the excitement or increase of heat by motion, 

 as by bellows and wind ; for which see Instance 29, Table 3. And 

 similarly in other modes of motion, for which sec Instances 28 and 31, 

 Table 3. Again, it is displayed in the extinction of tire and heat by 

 all strong compression which checks and stops motion ; for which see 

 Instances 30 and 32, Table 3. It is also shown by the fact that every 



