A Preliminary Discourse on the Study of Natural Philosophy

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Longman, Rees, Orme, Brown and Green, 1831 - 372 pàgines
 

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Pàgina 172 - It is observed that dew is never copiously deposited in situations much screened from the open sky, and not at all in a cloudy night; but if the clouds withdraw even for a few minutes, and leave a clear opening, a deposition of dew presently begins, and goes on increasing. . . . Dew formed in clear intervals will often even evaporate again when the sky becomes thickly overcast.
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Pàgina 170 - 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 experiment is easy ; we have only to lay a thermometer in contact with the dewed substance, and hang one at a little distance above it, out of reach of its influence. The experiment has been therefore made; the question has been asked, and the answer has been invariably in the affirmative. Whenever an object contracts dew, it it colder than the...
Pàgina 7 - Nothing, then, can be more unfounded than the objection which has been taken in limine, by persons, well meaning perhaps, certainly narrow-minded, against the study of natural philosophy, and, indeed, against all science, — that it fosters in its cultivators an undue and overweening self-conceit, leads them to doubt the immortality of the soul, and to scoff at revealed religion.
Pàgina 184 - It can hardly be pressed forcibly enough on the attention of the student of nature, that there is scarcely any natural phenomenon which can be fully and completely explained in all its circumstances, without a union of several, perhaps of all, the sciences.
Pàgina 15 - A mind which has once imbibed a taste for scientific inquiry, and has learnt the habit of applying its principles readily to the cases which occur, has within itself an inexhaustible source of pure and exciting contemplations...

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