Physical and Metaphysical Inquiries

T. Maccleish and Company, 1806 - 335 Seiten

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Seite 14 - ... existence, natural or real, distinct from their being perceived by the understanding. But with how great an assurance and acquiescence soever this principle may be entertained in the world, yet whoever shall find in his heart to call it in question may, if I mistake not, perceive it to involve a manifest contradiction. For what are the forementioned objects but the things we perceive by sense? and what do we perceive besides our own ideas or sensations? and is it not plainly repugnant that any...
Seite 122 - Nothing but my will, a thought of my mind; my thought only changing, the right hand rests, and the left hand moves. This is matter of fact, which cannot be denied: explain this, and make it intelligible, and then the next step will be to understand creation.
Seite 32 - underftood not to fpeak philofophically and pro" perly, but grofsly, and according to fuch concep" tions as people would be apt to frame from feeing " thefe experiments ; for the rays, to fpeak pro" perly, are not coloured : in them there is no" thing elfe than a certain power and difpofition *' to ftir up a fenfation of this or that colour.
Seite 122 - If you do not understand the operations of your own finite mind, that thinking thing within you, do not deem it strange that you cannot comprehend the operations of that eternal, infinite Mind who made and governs all things, and whom the heaven of heavens cannot contain.
Seite 107 - We have only to fuppofe the quantity of caloric to be proportioned to the diftance ; and if a fmall quantity exifts in Mercury, no more heat may be excited than is done by a large quantity in Saturn. There ftill remain fome other points of inquiry concerning heat. It will be afked, how heat is produced, if it come not from the body of the fun ? I can only anfwer this queftion by referring it to the fource which is common to all material powers. The action of light upon body produces colours; that...
Seite 232 - To suppose a finite being to be selfexistent, is to say that it is a contradiction for that being not to exist, the absence of which may yet be conceived without a contradiction. Which is the greatest absurdity in the world.
Seite 134 - The connexion between these propositions is not intuitive. There is required a medium, which may enable the mind to draw such an inference, if indeed it be drawn by reasoning and argument.
Seite 235 - That to suppose immensity removed out of the universe, or not necessarily eternal, is an express contradiction is intuitively evident to every one who attends to his own ideas and considers the essential nature of things. To suppose any part of space removed is to suppose it removed from and out of itself; and to suppose the whole to be taken away is supposing it to be taken away from itself, that is, to be taken away while it still remains, which is a contradiction in terms.
Seite 57 - Berkeley that we never calculate diftance by the bignefs of the angle made by the meeting of the two optic axes, or that we never think of the greater of kfs divergency of the rays which fall upon the pupil.
Seite 106 - It fhews that light produces heat merely by exciting, an infenfible action betwixt caloric and the particles of matter contained in bodies. It accounts for the want of heat in the upper regions of the atmofphere by the want of fufficient matter to produce the action of caloric ; and. for the cold of the night and the polar regions, by the want of that action which the fun produces.

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