Book, Paragraph

 1      I, 27|         problem: for perhaps we ought not only to investigate
 2      I, 31|     weak syllogism; for what it ought to prove, it begs, and it
 3      I, 31|        begged: and this is what ought to have been proved syllogistically.
 4      I, 31|        just this again which he ought to have demonstrated. Always
 5      I, 31|      and as extremes that which ought to have been the subject
 6      I, 31|       will have assumed what he ought to have proved. He cannot
 7      I, 33| positing of the terms; and this ought not to escape our notice.
 8      I, 34|         possesses the condition ought always to be substituted
 9      I, 36|   qualification, that the terms ought always to be stated in the
10      I, 36|   contraries, but the premisses ought to be understood with reference
11      I, 38|       repeated in the premisses ought to be joined to the first
12      I, 39|                           39~We ought also to exchange terms which
13      I, 44|         an hypothesis; these we ought to consider and mark out
14      I, 45|        what we have said how we ought to reduce syllogisms, and
15     II, 11|  contrary but the contradictory ought to be supposed in all the
16     II, 17|       the impossible conclusion ought to be connected with the
17     II, 17|       assumption. Or perhaps we ought not to understand the statement
18     II, 19|      once is the middle. How we ought to watch the middle in reference
19     II, 19|       in their admissions, they ought in attack to try to conceal.
20     II, 19|         being middle terms. One ought then to ask whether A belongs
21     II, 19|     through one middle term, he ought to begin with that: in this
22     II, 24|         resembles the third. It ought to be known both that the
23     II, 26|     premisses. But an objection ought not to turn off into other