Deductive Logic by St. George William Joseph Stock

Author:St. George William Joseph Stock [Stock, St. George William Joseph]
Language: eng
Format: epub
Tags: Logic
Published: 2004-08-31T16:00:00+00:00

Minor term Major term \ Consequent or

.'. All whales are warm-blooded > Conclusion.

§ 548. The reason why the names 'major, 'middle' and 'minor' terms were originally employed is that in an affirmative syllogism such as the above, which was regarded as the perfect type of syllogism, these names express the relative quantity in extension of the three terms.

[Illustration]

§ 549. It must be noticed however that, though the middle term cannot be of larger extent than the major nor of smaller extent than the minor, if the latter be distributed, there is nothing to prevent all three, or any two of them, from being coextensive.

§ 550. Further, when the minor term is undistributed, we either have a case of the intersection of two classes, from which it cannot be told which of them is the larger, or the minor term is actually larger than the middle, when it stands to it in the relation of genus to species, as in the following syllogism—

All Negroes have woolly hair.

Some Africans are Negroes.

.'. Some Africans have woolly hair.

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