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action alumina amber ammonia antozone appears atmosphere atoms attraction augite beds body boiling Brongt carbon Carboniferous cerium character chemical chlorhydric acid chlorid coal color comet containing crystalline crystals density diameter dilute diorite Diptera direction distance dolerite earth electric ether ethylene fauna feet feldspar force formation fossils genera genus geological gives heat Herbivores hills hornblende hyposulphite inches iridium iron Journal lake latter Lepidodendron less liquid mass Meissner metals meteors miles mineral molecular molecules mountain nearly nebula nitric acid North observations obtained olivine orbit oxyd oxygen ozone particles period plants plates platinum portion potash potassium precipitate present probably produced Prof pyroxene quantity remarkable rocks rotation ruthenium salt seen separated sesquioxyd silica soda solar solution species specimens stars structure substance sulphate sulphid of ethylene sulphuric acid surface temperature thallium thickness tion titanic acid trachytes tube
Seite 137 - Annual Report of the Regents of the University of the State of New York, on the Condition of the State Cabinet of Natural History, and the Historical and Antiquarian Collection annexed thereto.
Seite 447 - Resolved by the National Academy of Sciences, That, in the opinion of this academy, the volumes entitled "Sailing Directions," heretofore issued to navigators from the Naval Observatory, and the "Wind and Current Charts," which they are designed to illustrate and explain, embrace much which is unsound in philosophy, and little that is practically useful ; and that therefore these publications ought no longer to be issued in their present form.
Seite 385 - From the beginning of the phenomenon there was not a space in the firmament equal in extent to three diameters of the moon which was not filled every instant with bodies or falling stars. All the meteors left luminous traces or phosphorescent bands behind them, which lasted seven or eight seconds.
Seite 384 - And afterward they fell from the sky in such numbers, and so thickly together, that as they descended low in the air, they seemed large and fiery, and the sky and the air seemed to be in flames, and even the earth appeared as if ready to take fire. That portion of the sky where there were no stars, seemed to be divided into many parts, and this lasted for a long time.
Seite 239 - ... is visible almost to their summits ; and though I have observed in Canada and Nova Scotia many old sea-beaches, gravel-ridges, and lakemargins, I have seen nothing that could fairly be regarded as the work of glaciers. The so-called moraines, in so far as my observation extends, are more probably shingle beaches and bars, old coast-lines loaded with boulders, trains of boulders or
Seite 138 - Preliminary Notice of the Fauna of the Potsdam Sandstone ; with remarks upon the Previously known species of Fossils, and Descriptions of some New Ones, from the Sandstone of the Upper Mississippi Valley. Ibid., pp. 119-209, 6 plates. 127. Supplementary Note on the Potsdam Sandstone.
Seite 188 - When accident brings them into the immediate neighbourhood of the earth, they produce the phenomena of shooting-stars and fireballs. It has been shown by repeated observation, that on a bright night twenty minutes seldom elapse without a shooting-star being visible to an observer in any situation. At certain times these meteors are observed in astonishingly great numbers; during the meteoric shower at Boston, which lasted nine hours, when they were said to fall " crowded together like snow-flakes,"...
Seite 196 - ... excellent experiments made by Pouillet at different altitudes with the pyrheliometer. These experiments show that, everything else being equal, the generation of heat by the solar rays is more powerful in higher altitudes than near the surface of our globe, and that consequently a portion of these rays is absorbed on their passage through the atmosphere. Why, in spite of this partial absorption, the mean temperature of low altitudes is nevertheless higher than it is in more elevated positions,...
Seite 211 - Still the variation in the. intensity of light is not universally such as should follow if the comet merely reflected the sun's rays under certain permanent conditions, and we are under the necessity of looking to physical causes inherent in the body itself for an explanation of some few observations which appear irreconcilable with the theory of reflected solar light.