Essay towards an easy and useful system of logic

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Duncan, 1834 - 170 Seiten
 

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Seite 157 - Now a fallacy may aptly be compared to some adulterated compound ; it consists of an ingenious mixture of truth and falsehood, so entangled, so intimately blended, that the falsehood is (in the chemical phrase) held in solution: one drop of sound Logic is that test which immediately disunites them, makes the foreign substance visible, and precipitates it to the bottom.
Seite 104 - He and his agency are altogether good and holy, and that He is the fountain of all holiness. It would be strange arguing, indeed, because men never commit sin, but only when God leaves them to themselves, and necessarily sin, when he does so, that therefore their sin is not from themselves...
Seite 99 - ... upon the Earth, could not, according to all appearance, live upon the other planets; but ought there not to be a diversity of organization suited to the various temperatures of the globes of this universe? If the difference of elements and climates alone causes such variety in the productions of the Earth, how infinitely diversified must be the productions of the planets and their satellites? The most active imagination cannot form any just idea of them, but still their existence is, at least,...
Seite 122 - And Dr. Brown defines anger to be " that emotion of instant displeasure, which arises from the feeling of injury done or the discovery of injury intended, or, in many cases, from the discovery of the mere omission of good offices to which we conceived ourselves entitled, though this very omission may, of itself, be regarded as a species of injury.
Seite 98 - This luminary not only acts by its attraction upon all these globes, and compels them to move around him, but imparts to them both light and heat ; his benign influence gives birth to the animals and plants which cover the surface of the earth, and analogy induces us to believe, that it produces similar effects on the planets ; for, it is not natural to suppose that matter, of which we see the fecundity develop itself in such various ways, should be sterile upon a planet so large as Jupiter, which,...
Seite 143 - ... figure : or it may be the predicate of both premises, and then the syllogism is of the second figure; or it may be the subject of both, which makes a syllogism of the third figure •; or it may be the predicate of the major proposition, and the subject of the minor, which makes the fourth figure. Aristotle takes no notice of the fourth figure. It was added by the famous Galen, and is often called the Galenical figure. There is another division of syllogisms according to their modes. The mode...
Seite 157 - ... means, to parse every sentence we utter. The chemist (to pursue the illustration) keeps by him his tests and his method of analysis, to be employed when any substance is offered to his notice, the composition of which has not been ascertained, or in which adulteration is suspected. Now a fallacy may aptly be compared to some adulterated compound; " it " consists of an ingenious mixture of truth and " falsehood, so entangled,—so intimately blend...
Seite 164 - The habit of committing our thoughts to writing is a powerful means of expanding the mind, and producing a logical and systematic arrangement of our views and opinions. It is this which gives the writer a vast superiority, as to the accuracy and extent of his conceptions, over the mere talker. No one can ever hope to know the principles of any art or science thoroughly who does not write as well as read upon the subject."— Blakey.
Seite 10 - ... to the health of your mind. Do not exercise any one faculty unduly. Do not indulge the imagination. Read no novels, and but little poetry. Do not overload the memory. Think as well as read ; but do not think intensely on any one subject ; the reasoning powers then become distracted and enfeebled. "A quickness of mental perception, a lively and vigorous imagination, and a ready and retentive memory, are highly useful and ornamental qualities ; but they are individually limited in their beneficial...

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