On the structure of the syllogism,

De Morgan (Augustus)

On the structure of the syllogism,

and on the application of the theory of probabilities to questions of argument and authority. Offprint from: Transactions of the Cambridge Philosophical Society, Vol. VIII (read November 9, 1846).

Description: FIRST EDITION, corners a little rubbed, pp. [2], 30, 4to, contemporary (probably original, possibly rebacked) plain wrappers, frayed at fore-edges, tear in upper wrapper

Publication Details: Cambridge: The Pitt Press, by John W. Parker, 1847

Notes: The rare separately-paginated offprint, inscribed by De Morgan, of this important precursor to his book Formal Logic, published later in the same year. One of De Morgan's contributions in this paper led to a famous controversy – his theory of the 'quantification of the predicate', which refers to the process of allowing the middle term of a syllogism to be made susceptible to 'all' and 'some' (so in addition to 'all Xs are Ys' etc. one has 'all/some X is all/some/not any Y', etc.). The same theory was introduced independently by the Scottish philosopher William Hamilton (1788-1856) in his le...more

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Price: £650

Subject: Sciences

Published Date: 1847

Stock Number: 64290

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