The American Journal of Science, Volumes 145-146J.D. & E.S. Dana, 1893 |
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Common terms and phrases
amount analcite analysis antimony apparatus appears beds bromide cæsium carbon Catskill cent Ceratops charcoal Chem Chemung chloride circuit clay color Comanche Series compound containing copper Coryphodon Cretaceous crystals deposits described determined diabase dilute disk dissolved electrical electromotive force Eocene epoch evidence experiments fauna feet formation formula fossils Geol Geological given glacial gray H₂O Hall heat hydrochloric acid hydrogen ignited iodide iodine iron lead chloride limestone liquid magnetic Magothy mass measured meter method microscope miles mineral Miocene moraine Mountain nearly nitrate nitric acid observed obtained Oneonta oxide oxygen paper plates portion potassium potassium chloride potassium iodide precipitate present pressure probably produced Prof Professor ratio region resonance rock rubidium salt sand sandstone SCI.-THIRD SERIES shales shown sodium solution species specimens strata sulphate sulphuric acid surface temperature thickness tion tube upper vibrations
Popular passages
Page 126 - ... in size from a fraction of an inch to a foot or more in diameter the average size being about three inches.
Page 420 - Elementary Treatise on Physics, Experimental and Applied, for the use of Colleges and Schools. Translated and edited from GANOT'S ' Elements de Physique ' (with the Author's sanction) by E.
Page 203 - Mackintosh as proof that a period of not more than 6,000 years has elapsed since the boulders were left in their positions. The vertical extent of this denudation, averaging about six inches, is nearly the same with that observed in the southwest part of the Province of Quebec by Sir William Logan and Dr. Robert Bell, where veins of quartz marked with glacial striae stand out to various heights not exceeding one foot above the weathered surface of the enclosing limestone.
Page 52 - Viscosity must tend to the retention of steam within the basin, and, as in the case of the super-heated waters, where the temperature stands at or above the boiling point, explosive liberation must follow. All alkaline solutions, whether in the laboratory or in nature, exhibit, by reason of this viscosity, a tendency to bump and boil irregularly. Viscosity in these hot springs must also tend to the formation of bubbles and foam when the steam rises to the surface, aud this in turn aids to bring about...
Page 203 - Geikie maintains that the use of palaeolithic implements had ceased, and that early man in Europe made neolithic (polished) implements, before the recession of the ice-sheet from Scotland, Denmark, and the Scandinavian peninsula; and Prestwich suggests that the dawn of civilization in Egypt, China, and India, may have been coeval with the glaciation of northwestern Europe. In Wales and Yorkshire the amount of denudation of limestone rocks on which boulders lie has been regarded by Mr.
Page 203 - America was separated by only a very short interval, geologically speaking, from the present time, is seen in the wonderfully perfect preservation of the glacial striation and polishing on the surfaces of the more enduring rocks. Of their character in one noteworthy district, Dr. Bell writes as follows: "On Portland promontory on the east coast of Hudson's bay, in latitude 58°, and southward the high rocky hills are completely glaciated and bare. The striae are as fresh-looking as if the ice had...
Page 422 - Toxodontia, which are so widely different from the hoofed mammals of the northern hemisphere ; together with some primitive forms of primates, creodonts and marsupials. The marsupials are of extraordinary interest, for they comprise not only forms allied to the opossums, but also to recent Australian forms such as Thylacinus, Dasyurus and Ilypsiprymnus. This is n most unexpected fact, and seems to point unmistakably to a great southern circumpolar continent.
Page 16 - ... has been and is of such value that a form taken in the remote past by the solid earth would not be modified by the tidal retardation of rotation and its attendant change of centrifugal force. There is in modern geology a growing body of evidence which is believed to prove the very general plasticity of the lithosphere, by which it may experience important deformations from very slowly applied stresses. So strongly has this belief taken root that many American geologists accept “isostasy”...
Page 74 - The great blue heron (Ardea herodias) is about 4 feet in length from the point of the bill to the end of the tail, and nearly 6 feet across the wings.
Page 206 - Dana's time-ratios and concludes that the time needed for the earth's stratified rocks and the unfolding of its plant and animal life must be about a hundred millions of years.4 Mr.