Fragments of science for unscientific peopleD. Appleton, 1875 - 422 páginas |
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Página 9
... light is propagated , absolutely empty ? A century ago the answer to this question would be , " No , for particles of light are incessantly shot through space . " The reply of modern science is also negative , but on a somewhat differ ...
... light is propagated , absolutely empty ? A century ago the answer to this question would be , " No , for particles of light are incessantly shot through space . " The reply of modern science is also negative , but on a somewhat differ ...
Página 10
... light , and without it they could not be seen . This all - pervading substance takes up their molecular tre- mors , and conveys them with inconceivable rapidity to our or- gans of vision . It is the transported shiver of bodies count ...
... light , and without it they could not be seen . This all - pervading substance takes up their molecular tre- mors , and conveys them with inconceivable rapidity to our or- gans of vision . It is the transported shiver of bodies count ...
Página 11
... light when we approach a luminous source . In the one case , however , the coarse common nerves of the body suf- fice ; for the other we must have the finer optic nerve . But suppose the water withdrawn ; the action at a distance would ...
... light when we approach a luminous source . In the one case , however , the coarse common nerves of the body suf- fice ; for the other we must have the finer optic nerve . But suppose the water withdrawn ; the action at a distance would ...
Página 13
... light and heat , and the proxi- mate source of such other powers as are generated by light and heat . But we have now to inquire what is the light and what is the heat thus produced ? This question has already been answered in a general ...
... light and heat , and the proxi- mate source of such other powers as are generated by light and heat . But we have now to inquire what is the light and what is the heat thus produced ? This question has already been answered in a general ...
Página 14
... light metal , alumin- iun . By far the greater portion of the earth's crust is compounded of the elementary substances mentioned in these few lines . The principle of gravitation has been already described as an attraction which every ...
... light metal , alumin- iun . By far the greater portion of the earth's crust is compounded of the elementary substances mentioned in these few lines . The principle of gravitation has been already described as an attraction which every ...
Palavras e frases frequentes
absorbed absorption Acetic ether action angle aqueous vapor atmosphere atoms attraction blue body called carbonic acid cause chemical chemical affinity cleavage cloud color crystal dark rays diamagnetic direction disease distance earth effect emitted energy experiment experimental tube fact Faraday flame flask floating matter force gases germs glass gravity hydrogen imagination intellectual invisible rays iron John Herschel JOHN TYNDALL liquid magnet mass Matterhorn mechanical ment microscope mind miracles molecular molecules motion Mozley Nature needle nerve Nicol nitrite of amyl observed optic optic nerve oxygen particles pass Pasteur pébrine perfectly phenomena philosopher physical planet platinum polarization pole possess present prism produced quantity question radiant heat radiation regards render repulsion result retina scientific solar space spectrum substance surface temperature things thought tion ultra-red velocity vibrations vis viva visible viva wire
Passagens conhecidas
Página 411 - XVIII. The Nature of Light: With a General Account of Physical Optics.
Página 318 - Fame is the spur that the clear spirit doth raise (That last infirmity of noble mind) To scorn delights and live laborious days; But the fair guerdon when we hope to find, And think to burst out into sudden blaze, Comes the blind Fury with th' abhorred shears, And slits the thin-spun life. 'But not the praise...
Página 416 - Our Place among Infinities: A Series of Essays contrasting our Little Abode in Space and Time with the Infinities Around us. Crown 8vo, cloth extra, 6s. The Expanse of Heaven : A Series of Essays on the Wonders of the Firmament.
Página 108 - ... the passage from the physics of the brain to the corresponding facts of consciousness is unthinkable. Granted that a definite thought and a definite molecular action in the brain occur simultaneously, we do not possess the intellectual organ, nor, apparently, any rudiment of the organ, which would enable us to pass by a process of reasoning from the one phenomenon to the other. They appear together, but we do not know why.
Página xvi - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.
Página 114 - Was war' ein Gott, der nur von aussen stiesse, Im Kreis das All am Finger laufen liesse ! Ihm ziemt's, die Welt im Innern zu bewegen, Natur in Sich, Sich in Natur zu hegen, So dass, was in Ihm lebt und webt und ist, Nie Seine Kraft, nie Seinen Geist vermisst.
Página 108 - I do not think he is entitled to say that his molecular groupings and his molecular motions explain everything. In reality they explain nothing. The utmost he can affirm is the association of two classes of phenomena, of whose real bond of union he is in absolute ignorance. The problem of the connection of body and soul is as insoluble in its modern form as it was in the pre-scientific ages.
Página 84 - Self-reverence, self-knowledge, self-control, These three alone lead life to sovereign power. Yet not for power (power of herself Would come uncall'd for) but to live by law, Acting the law we live by without fear; And, because right is right, to follow right Were wisdom in the scorn of consequence.
Página 416 - The Principles of Mental Physiology. With their Applications to the Training and Discipline of the Mind, and the Study of its Morbid Conditions.
Página 416 - ADDRESS DELIVERED BEFORE THE BRITISH ASSOCIATION, assembled at Belfast. By JOHN TYNDALL, FRS, President. Revised, with additions, by the author, since the delivery.