By W. H. S. Monck
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Extra info for An Introduction to Logic (Second Edition) (1890)
I walk down the next That is the proof that the street and I meet a dog. word has an extension. If I met an unicorn, that term would have an extension is also. These terms afford us a short way of expressing what The Pro asserted in any proposition or judgment. position Every Man Rational, asserts that the is com prehension or connotation of the term Eational is found in all the individuals comprised in the extension or Man. denotation of the term Every Equilateral Tri comprehension or angle Equiangular, connotation of the term Equiangular is found in all the individuals comprised in the extension of the term asserts that the is Equilateral- Triangle.
T It will probably occur to the reader that there might be several indivi and so John Thompson would be a general duals called John singular Thompson, Forms of Propositions. and that called a general idea, is might be called a singular 5 of a singular idea. is Logic term mainly concerned with general terms and general ideas, as it will be found that a very little information can be con introducing them. veyed without Thus, if I say we express a general term, because many other persons have been wise as well as Socrates.
Though From Some men are not black, in like manner, you cannot infer No men are black. In fact there is a valuable general that rule applicable to all these inferences, viz. that you can not increase the quantity of a term (unless indeed you are inferring the falsehood instead of the truth of the proposition in which the term occurs with the larger For it is self-evident that something may be quantity) . true of a part, but not of the whole or of a different part An 28 Introduction to Logic. same whole and hence, whenever a term is parti cular in the original proposition it cannot be universal in the inference derived from it.