Logic: Designed as an Introduction to the Study of Reasoning

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W. Allen, 1864 - 209 páginas
 

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Página 37 - 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.
Página 203 - That there is satisfactory evidence, that many, professing to be original witnesses of the Christian miracles, passed their lives in labours, dangers, and sufferings, voluntarily undergone in attestation of the accounts which they delivered, and solely in consequence of their belief of those accounts ; and that they also submitted, from the same motives, to new rules of conduct.
Página 145 - When we say, All men are mortal Socrates is a man therefore -•'Socrates is mortal; it is unanswerably urged by the adversaries of the syllogistic f.
Página 152 - All inference is from particulars to particulars : General propositions are merely registers of such inferences already made, and short formulae for making more : The major premiss of a syllogism, consequently, is a formula of this description : and the conclusion is not an inference drawn from the formula, but an inference drawn according to the formula : the real logical antecedent, or...
Página 108 - Achilles run ten times as fast as the tortoise, yet if the tortoise has the start, Achilles will never overtake him. For suppose them to be at first separated by an interval of a thousand feet: when Achilles has run these thousand feet, the tortoise will have got on a hundred; when Achilles has run those hundred, the tortoise will have run ten, and so on for ever: therefore Achilles may run for ever without overtaking the tortoise.
Página 141 - ... again. He believes this in every case which happens to arise; but without looking, in each instance, beyond the present case. He is not generalizing; he is inferring a particular from particulars. In the same way, also, brutes reason.
Página 108 - ... does not mean any length of time ; it means any number of subdivisions of time. It means that we may divide a thousand feet by ten, and that quotient again by ten, and so on as often as we please ; that there never...
Página 142 - Logic is not the science of Belief, but the science of Proof, or Evidence. In so far as belief professes to be founded on proof, the office of logic is to supply a test for ascertaining whether or not the belief is well grounded.
Página 149 - If a man is asked a question, and is at the moment unable to answer it, he may refresh his memory by turning to a memorandum which he carries about with him. But if he were asked, how the fact came to his knowledge, he would scarcely answer, because it was set down in his notebook : unless the book was written, like the Koran, with a quill from the wing of the angel Gabriel.
Página 16 - Whether angels passed from one point of space to another without passing through the intermediate points ? Whether they can visually discern objects in the dark? Whether more than one angel can exist at the same moment in the same physical point?

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