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abstraction admitted agreement analysis angles appear applied argument assent associated attention called certain character circle clear common comparatively conceptions conclusion connexion consequence considered consists defined definitions demonstrative difficulty distinct effects employed equal Essay essential ethics Euclid evidence exact existence experience expressed facts feeling figure further geometry give given habit human hypothesis ideas important impressions inquiry kind knowledge language laws less lines Locke logic magnitudes mathe mathematical reasoning matical matter meaning measure mental metaphysical method mind modes moral nature necessary notions object observations perceive perhaps philosophy physical premises present principles proof proposition quantity question reader reference relations remarks rest result reviewer says sense sensible signs simple space speaks Stewart student sufficient suppose syllogism thing thought tion traced triangle true truth understand various whole writers
Page iii - Read not to contradict and confute, nor to believe and take for granted: But to weigh and consider.
Page 47 - In this case then, when the mind cannot so bring its ideas together, as by their immediate comparison, and as it were juxta-position or application one to another, to perceive their agreement or disagreement, it is fain, by the intervention of other ideas (one or more, as it happens) to discover the agreement or disagreement which it searches ; and this is that which we call reasoning.
Page 18 - In this place we are concerned with nominal definitions only, (except, indeed, of logical terms,) because all that is requisite for the purposes of reasoning (which is the proper province of Logic) is, that a term shall not be used in different senses : a real definition of any thing belongs to the science or system which is employed about that thing.
Page 54 - From this general contrast it will easily be seen, how an excessive study of the mathematical sciences not only does not prepare, but absolutely incapacitates the mind, for those intellectual energies which philosophy and life require.
Page 51 - ... practice, or that even if it had not, it might not still be a dignified and interesting pursuit. One of the chief impediments to the attainment of a just view of the nature and object of logic, is the not fully understanding, or not sufficiently keeping in mind, the SAMENESS of the reasoning process in all cases.
Page 12 - A plane rectilineal angle is the inclination of two straight lines to one another, which meet together, but are not in the same straight line.
Page 46 - The next degree of knowledge is, where the mind perceives the agreement or disagreement of any ideas, but not immediately.
Page 32 - In any right-angled triangle, the square which is described on the side subtending the right angle is equal to the squares described on the sides which contain the right angle.
Page 47 - Now, in every step reason makes in demonstrative knowledge, there is an intuitive knowledge of that agreement or disagreement it seeks with the next intermediate idea, which it uses as a proof : for if it were not so, that yet would need a proof; since without the perception of such agreement or disagreement there is no knowledge produced. If it be perceived by itself, it is intuitive knowledge : if it cannot be perceived by itself, there is need of some intervening idea, as a common measure, to...
Page 47 - Those intervening ideas which serve to show the agreement of any two others, are called proofs; and where the agreement or disagreement is by this means plainly and clearly perceived, it is called demonstration, it being shown to the understanding, and the mind made to see that it is so.