Elements of Logic Comprising the Doctrine of the Laws And Products of Thought

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109 Middle term in the Sumption is not used in the same extent of meaning as in the Subsumption. There are really four terms. When we have a Subsumption in Particular Quan- tity, so-called, a, for example, Man is mortal ; some rational beings are men ; obviously we cannot conclude : therefore, rational beings are mortal; for we have changed the mean- ing of the Minor term, using it in a wider extent in the Con- clusion, and a narrower in the Subsumption. But commonly, if the Minor term be used ...in a wider extent of meaning in the Subsumption than in the Conclusion, as, Man is mortal ; philosophers are men ; therefore, some philosophers are mortal, we have a valid conclusion, it is true, but a mixed reasoning, as just stated.
Logicians have enounced the comprehensive rule for the conclusion, thus: The Conclusion must always follow the weaker or worser part, the negative and the particular being regarded as the weaker or the worser in respect of the affirm- ative and the universal.
The general relations of the several judgments which com- pose, a Deductive Reasoning to one another, moreover, logi- cians have illustrated to the eye by means of three unequal circles, the largest of which represents the Major term, the smallest the Minor, and the intermediate the Middle term.


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