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Books Books 1 - 2 of 2 on But it is not immediately obvious when the middle term enters one of the premises....  
" But it is not immediately obvious when the middle term enters one of the premises universally. The following reasoning will serve for exercise in the preceding results. Since both premises are particular in form, the middle term can only enter one of... "
First notions of logic, preparatory to the study of geometry - Page 17
by Augustus De Morgan - 1840 - 32 pages
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Studies and Exercises in Formal Logic: Including a Generalisation of Logical ...

John Neville Keynes - Logic - 1884 - 414 pages
...obtained. [De Morgan (Formal Logic, p. 14) proves this corollary as follows : " Since both premisses are particular in form, the middle term can only enter...predicate of a negative proposition ; consequently the other premiss must be affirmative, and, being particular, neither of its terms is universal. Consequently...
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A Manual of Logic, Volume 1

James Welton - Logic - 1896
...best proof that two particulars prove nothing is that given by De Morgan (Formal Logic, p. 14) : "Since " both premises are particular in form, the...predicate " of a negative proposition ; consequently (Rule V) the other " premise must be affirmative, and, being particular, neither " of its terms is universal....
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