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according already appear astronomers atmosphere belonging bodies brightness called cause celestial centre century clouds clusters colour comets compared connection considerations contains cosmical dark determination diameter direction discovered discovery disk distance double stars early Earth English entire equal existence expressed fall feet fixed stars force geographical miles given greater heavens idea important increase intensity John Herschel Jupiter knowledge known later less light luminous magnitude Mars mass mean measurements meteoric Milky Moon motion naked eye nature nebulæ Notes noticed object observations orbits particular period phænomena physical planetary planets points position present probably processes rays recognised reflected regarded regions relations remains remarked respecting ring round satellites Saturn seen Sir John solar sometimes southern space sphere surface telescope tion Universe Uranus variable Venus visible whole
Strona 395 - But to derive two or three general principles of motion from phaenomena, and afterwards to tell us how the properties and actions of all corporeal things follow from those manifest principles, would be a very great step in philosophy, though the causes of those principles were not yet discovered. And therefore I scruple not to propose the principles of motion above mentioned, they being of very general extent, and leave their causes to be found out.
Strona 399 - ... of those great deposits of dynamical efficiency which are laid up for human use in our coal strata. By them the waters of the sea are made to circulate in vapour through the air, and irrigate the land, producing springs and rivers.
Strona xiv - ... reflector broken up into masses , whose mottled and curdling light evidently indicates , by a sort of granular texture , its consisting of stars, and when examined under the great light of Lord ROSSE'S reflector, or the exquisite defining power of the great achromatic at Cambridge, US, is evidently perceived to consist of clustering stars.
Strona 395 - I do not here consider. What I call attraction may be performed by impulse, or by some other means unknown to me. I use that Word here to signify only in general any Force by which Bodies tend towards one another, whatsoever be the Cause.
Strona vii - I think I may safely say, that there can be little, if any, doubt as to the resolvability of the nebula.
Strona xiv - Rosse's reflector, or the exquisite defining power of the great achromatic at Cambridge, US, is evidently perceived to consist of clustering stars. There can therefore be little doubt as to the whole consisting of stars, too minute to be discerned individually even with these powerful aids, but which become visible as points of light when closely adjacent in the more crowded parts in the mode already more than once suggested.
Strona li - Arago signale la comparaison de l'intensité lumineuse de la portion de la Lune, que les rayons solaires éclairent directement, avec celle de la partie du même astre qui reçoit seulement les rayons réfléchis par la Terre. Il croit, d'après les expériences qu'il a déjà tentées à cet égard, qu'on pourra avec des...