A Preliminary Discourse on the Study of Natural Philosophy

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Longman, Brown, Green & Longmans, 1840 - 372 pàgines
 

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Pàgina 53 - As to the sailor, when you look down from the quarter deck to the space below, you see the utmost extremity of human misery, such crowding, such filth, such stench !"—" A ship is a prison with the chance of being drowned — it is worse — worse in every respect —. worse
Pàgina 156 - which would never have been otherwise ascertained to exist, which is a small anticipation of the time of its reappearances or a diminution of its periodic time, which cannot be accounted .for by gravity, and whose cause is therefore to be enquired into. Such an anticipation would be caused by the resistance of a medium
Pàgina 160 - (164.) But, in the case of the night dew, is this a real cause — is it a fact that the object dewed is colder than the air ? Certainly not, one would at first be inclined to say; for what is to make it so ? But the analogies are
Pàgina 357 - or that there is no one Thing in Nature whereof the Uses to human Life are yet thoroughly understood. * The whole history of the arts since Boyle's time has been one continued comment on this text; and if we regard among the uses of the works of nature,
Pàgina 157 - M. Arago, having suspended a magnetic needle by a silk thread, and set it in vibration, observed, that it came much sooner to a state of rest when suspended over a plate of copper, than when no such plate was beneath it. Now, in both cases there were two vene
Pàgina 44 - III. In. enabling us to accomplish our ends in the easiest, shortest, most economical, and most effectual manner. IV. In inducing us to attempt, and enabling us to accomplish, objects which, but for such knowledge, we should never have thought of undertaking.
Pàgina 70 - universally intelligible. Art is the application of knowledge to a practical end. If the knowledge be merely Accumulated experience, the art is empirical; but if it be experience reasoned upon and brought under general principles, it assumes a higher character, and becomes a scientific art. In the progress
Pàgina 272 - In this great work, Newton shows all the celestial motions known in his time to be consequences of the simple law, that every particle of matter attracts every other particle in the universe with a force proportional to the product of their masses directly, and the square of their
Pàgina 51 - most approved, with occasional failures,) as a specific, or natural antagonist, against that odious deformity. It is thus that any accession to our knowledge of nature is sure, sooner or later, to make itself felt in some practical application, and that a benefit conferred on science by the casual observation or• shrewd remark of even an unscientific or illiterate
Pàgina 72 - the more abundant supply of our physical wants, and the increase of our comforts. Great as these benefits are, they are yet but steps to others of a still higher kind. The successful results of our experiments and reasonings in natural philosophy, and the incalculable advantages which experience, systematically consulted and dispassionately reasoned on, has

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