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aberration of light angle of incidence aperture atoms attraction augmented axis bands battery body bright cable called caused centre circuit coil colors conductor convex core crystal dark diamagnetic direction discharge distance double refraction duced earth elasticity electric current electrified electro-magnet electrode emission theory employed ether ether waves Faraday film flame force formed galvanometer glass heat helix Hence hydrogen Iceland spar illuminated index of refraction intensity iron lens lines liquid luminous magnetic marginal rays metals mirror motion needle object oblique obtained optic oxygen parallel particles passes perpendicular phenomena placed plane of vibration plate platinum polarized poles portion positive primary principal focus prism produce rays reflected refractive index repelled retardation retina rings rotation round screen secondary shadow slit solar spark spectrum spherical square substance thickness tion tourmaline transmitted undulation vapor velocity of light voltaic current waves white light wire zinc
Página 35 - It may also be defined as the sine of the angle of incidence divided by the sine of the angle of refraction, as light passes from air into the substance.
Página 196 - Personally and practically exercised in zoology, in minute anatomy, in geology, a. student of geographical distribution, not in maps and in museums, but by long voyages and laborious collection; having largely advanced each of these branches of science, and having spent many years in gathering and sifting materials for his present work; the store of accurately-registered facts upon which the author of the 'Origin of Species' is able to draw at will, is prodigious.
Página 26 - Why the image is seen as far behind the mirror as the object is in front of it.— Let AB be an arrow held Fig.
Página 202 - It was a happy thought which suggested the publication of this volume. The question is often asked, and not so easily answered, What are the new doctrines of the Correlation and Conservation of Forces ? In this volume we have the answer, and with the reasons of its chief* expounders ; those who are ignorant on that theme, can thus question the original authorities.
Página 199 - THIS is the latest and most popular of the works of this intrepid and accomplished English thinker. The American edition of the work is the latest, and contains, in addition to the English edition, Professor Huxley's recent masterly address on "Spontaneous Generation," delivered before the British Association for the Advancement of Science, of which he was president.
Página 104 - In its case the sine of the angle of incidence is to the sine of the angle of refraction...
Página 160 - ... a common candle ; quartz, the sapphire, magnesia, lime, all entered into fusion ; fragments of diamond and points of charcoal and plumbago rapidly disappeared and seemed to evaporate in it, even when the connection was made in a receiver exhausted by the air-pump ; but there was no evidence of their having previously undergone fusion.
Página 198 - This interesting work is the fruit of many years' research by an accomplished naturalist, and one well trained in modern scientific methods, into the mental, moral, and social condition of the lowest savage races. The want of a work of this kind had long been felt, and, as scientific methods are being more and more applied to questions of humanity, there has been...
Página 196 - Far abler men than myself may confess, that they have not that untiring patience in accumulating, and that wonderful skill in using, large masses of facts of the most varied kind, — that wide and accurate physiological knowledge, — that acuteness in devising...