a syllogism is not produced without a middle, but the middle is that of which we have frequently spoken. But in what manner it is necessary to observe the middle in regard to each conclusion, is clear from our knowing what kind of thing is proved in each figure, and this will not escape us in consequence of knowing how we sustain the argument.
Still it is requisite, when we argue, that we should endeavour to conceal that which we direct the respondent to guard against, and this will be done, first, it the conclusions are not pre-syllogized, but are unknown when necessary propositions are assumed, and again, if a person does not question those things which are proximate, but such as are especially immediate, for instance, let it be requisite to conclude A of F, and let the media be B C D E; therefore we must question whether A is with B, and again, not whether B is with C, but whether D is with E, and afterwards whether B is with C, and so of the rest. If also the syllogism arises through one middle, we must begin with the middle, for thus especially we may deceive the respondent.
Chapter 20
Since however we have when, and from what manner of terminal subsistence syllogism is produced, it
