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Popular Lectures on Scientific Subjects, Tr. by E. Atkinson. [1st]
Hermann Ludwig F. Von Helmholtz
No preview available - 2015
action animals appear become blue bodies bright carbon carbonic acid changes chemical affinity chemical forces colour combination combustion conception corresponding Crown 8vo crystalline lens depends direction disc electrical electrical currents excited experiments external objects fact fall fibres field of vision friction fundamental tone Geant glacier Goethe Hence human illumination impression instrument investigation kind Lectures light machine mass means mechanical force melt Mer de Glace motion moving musical natural forces natural philosopher observation optic nerve organs oxygen particles peculiar perception perpetual motion phenomena physical sciences physiology pieces of ice pitch possible present pressure processes produced quantity of heat rays recognise result retina scientific seen sensation sensations of sight senses separate sight snow steam-engine stereoscopic string surface temperature theory theory of colour tion upper partial tones velocity vibrations violet vis viva vols weight
Page 160 - And God said, Let there be light: and there was light. And God saw the light, that it was good: and God divided the light from the darkness. And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
Page 127 - ... from the size of a pin's head to that of a pea ; scattered through a large body of sand or clay ; and in this state it is called by the Mandingoes sanoo munko,
Page 153 - ... universe be delivered over to the undisturbed action of its physical processes, all force will finally pass into the form of heat, and all heat come into a state of equilibrium. Then all possibility of a further change would be at an end, and the complete cessation of all natural processes must set in. The life of men, animals, and plants could not of course continue if the sun had lost his high temperature, and with it his light, — if all the components of the earth's surface had closed those...