Artis logicę rudimenta, from the text of Aldrich, with notes, by H.L. Mansel

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Henry Longueville Mansel

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Page 146 - If a body moves, it must move either in the place where it is, or in the place where it is not : but either of these is impossible : therefore it cannot move.
Page lxxii - is the science of the operations of the understanding which are subservient to the estimation of evidence; both the process itself of proceeding from known truths to unknown, and all other intellectual operations in so far as auxiliary to this.
Page 260 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Page 108 - If A is B, C is D ; and if E is F, G is H ; But either A is B or E is F ; Therefore either C is D or G is H.
Page 199 - ... of other propofitions. To give an example : Alexander was the fon of Philip ; therefore Philip was the father of Alexander : A is greater than B ; therefore B is lefs than A.
Page l - Logic, he says may be defined as "the art which has for its object, or end in view, the giving, to the best advantage, direction to the human mind, and thence to the human frame, in its pursuit of any object or purpose to the attainment of which it is capable of being applied".
Page 176 - ... genera, ie, the most extensive classes into which things could be distributed ; which, therefore, were so many highest Predicates, one or other of which was supposed capable of being affirmed with truth of every nameable thing whatsoever.
Page 235 - The Hypothetical Syllogism, in like manner, is a form of reasoning distinct from the Categorical, and not reducible to it, being based on a different law of thought, namely, the logical Principle of Sufficient Reason, a ratione ad rationatum, a negatione rationati ad negationem rationis valet consequential...
Page 254 - The points, lines, circles, and squares which any one has in his mind, are (I apprehend) simply copies of the points, lines, circles, and squares which he has known in his experience.
Page 109 - If A is B, C is D; and if E is F, G is H; But either C is not D, or G is not H ; Therefore either A is not B, or E is not F.

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