Science Lectures for the People, Volumes 5-6John Heywood., 1874 |
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Page 9
... fact , both curious in itself and important in its applications , that any one of these processes ( not necessarily the same as that used for polarising ) may be used also as a means of examining whether the ray be in that condition or ...
... fact , both curious in itself and important in its applications , that any one of these processes ( not necessarily the same as that used for polarising ) may be used also as a means of examining whether the ray be in that condition or ...
Page 13
... fact , merely a reproduction in a simplified form of what has gone before . When polariser and analyser are placed in front of one another in what may be called a similar position , that is , when the vibrations in the image transmitted ...
... fact , merely a reproduction in a simplified form of what has gone before . When polariser and analyser are placed in front of one another in what may be called a similar position , that is , when the vibrations in the image transmitted ...
Page 16
... fact , consist of an assemblage of all others ; or , in other words , will be of a tint complementary to that which has been extinguished . It has been remarked that the colour produced by a plate of selenite depends upon the thickness ...
... fact , consist of an assemblage of all others ; or , in other words , will be of a tint complementary to that which has been extinguished . It has been remarked that the colour produced by a plate of selenite depends upon the thickness ...
Page 18
... fact , if a block of glass be unequally heated to a very moderate degree , the internal structural effects immediately reveal themselves by dark bands , which indicate the border land between strain and pressure . As the block cools ...
... fact , if a block of glass be unequally heated to a very moderate degree , the internal structural effects immediately reveal themselves by dark bands , which indicate the border land between strain and pressure . As the block cools ...
Page 19
... we shall find that we are continually using polarised light , although we should otherwise have been unaware of the fact . To mention one more instance ; if we turn our attention to the sky , and on a clear bright 19.
... we shall find that we are continually using polarised light , although we should otherwise have been unaware of the fact . To mention one more instance ; if we turn our attention to the sky , and on a clear bright 19.
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able acid animals appear atoms beautiful bird body bone burning called calx carbon carbonic acid Cave-earth cavern chemical colour contraction creatures crystals Dalton detonation disc distance earth earthquakes effect existence experiment explosive fact feathers feet fertilisation fibres flame flowers force give glass gun cotton gunpowder heat hyæna inch inflammable air insects instance iron Islands Isthmus of Tehuantepec John Dalton Kent's Cavern kind large number lava lecture light mammals Manchester marsupials mass means miles moon movements muscle muscular nature nerve nitric nitric acid object observe ovule oxygen parasites pass phenomena phlogiston plants plate polarisation pollen pollen-grains pollinia Priestley produced quantity region round saltpetre savages sensations species Stalagmite stamens stigma structure substance sun's supposed surface thickness transit of Venus Trichina tube valley Venus vibrations volcanic weight whole wing
Popular passages
Page 182 - A man so various, that he seemed to be Not one, but all mankind's epitome : Stiff in opinions, always in the wrong, Was everything by starts, and nothing long; But, in the course of one revolving moon, Was chemist, fiddler, statesman, and buffoon ; Then all for women, painting, rhyming, drinking, Besides ten thousand freaks that died in thinking.
Page 39 - FLOWER in the crannied wall, I pluck you out of the crannies, I hold you here, root and all, in my hand, Little flower — but if I could understand What you are, root and all, and all in all, I should know what God and man is.
Page 34 - Now at last we see the full use of every part of the flower, of the water-secreting horns, of the bucket half full of water, which prevents the bees from flying away, and forces them to crawl out through the spout, and rub against the properly placed viscid pollenmasses and the viscid stigma.
Page 200 - The feeling of it to my lungs was not sensibly different from that of common air, but I fancied that my breast felt peculiarly light and easy for some time afterwards. Who can tell but that in time this pure air may become a fashionable .article 1 Lee. cit. p. 94. in luxury ? Hitherto only two mice and myself have had the privilege of breathing it.
Page 34 - Catasetum, is widely different, though serving the same end; and is equally curious. Bees visit these flowers, like those of the Coryanthes, in order to gnaw the labellum; in doing this they inevitably touch a long, tapering, sensitive projection, or, as I have called it, the antenna. This antenna, when touched, transmits a sensation or vibration to a certain membrane which...
Page 95 - ... electricity,' and lecture learnedly about it, and grind the like of it out of glass and silk : but what is it ? What made it ? Whence comes it ? Whither goes it ? Science has done much for us; but it is a poor science that would hide from us the great deep sacred infinitude of Nescience, whither we can never penetrate, on which all science swims as a mere superficial film. This world, after all our science and sciences, is still a miracle ; wonderful, inscrutable, magical and more, to whosoever...
Page 34 - When the bee, thus provided, flies to another flower, or to the same flower a second time, and is pushed by its comrades into the bucket and then crawls out by the passage, the pollen-mass necessarily comes first into contact with the viscid stigma, and adheres to it, and the flower is fertilised.
Page 95 - At bottom we do not yet know ; we can never know at alL It is not by our superior insight that we escape the difficulty ; it is by our superior levity, our inattention, our want of insight. It is by not thinking that we cease to wonder at it. Hardened round us, encasing wholly every notion we form, is a wrappage of traditions, hearsays, mere words. We call that fire of the black thunder- cloud
Page 95 - We call that fire of the black thunder-cloud 'electricity,' and lecture learnedly about it, and grind the like of it out of glass and silk: but what is it? "What made it? Whence comes it? Whither goes it? Science has done much for us ; but it is a poor science that would hide from us the great deep sacred infinitude of Nescience, whither we can never penetrate, on which all science swims as a mere superficial film. This world, after all our science and sciences, is still a miracle ; wonderful, inscrutable,...
Page 184 - ... themselves when they heard I was to preach for him. But visiting that country some years afterwards, when I had raised myself to some degree of notice in the world, and being invited to preach in that very pulpit, the same people crowded to hear me, though my elocution was not much improved, and they professed to admire one -of the same discourses they had formerly despised.