The American Journal of Science, Volumen139,Tema 1406J.D. & E.S. Dana, 1890 |
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Términos y frases comunes
amount amphibole andalusite angles appears arsenious oxide axis basal beds Cambrian carbonate Carboniferous character chloride clays cleavage cm³ coil color containing corundum Cretaceous crystals deposits described determined Devonian distance distinct divergence electric error experiments faces fauna feet figure formation formula fossils gabbro Geological give given glacial graptolites heat hornblende inches indicated iodine Jour lansfordite length light limestone lithiophilite Loomis lower magnetic mass measured method microscope miles mineral mountain natural selection nearly nesquehonite observations obtained occur optical original oxide paper parallel plane plates pleochroism portion position present pressure prism prismatic probably Professor quartz quartzite Quebec Group region relations represented river rocks sand sandstone schists sediments shales shown Sillery Silurian slates solution species specimens spectrum stalactite strata sulphuric acid surface temperature thickness tion tube upper valley volume zone
Pasajes populares
Página 24 - This long appeared to me a great difficulty: but it arises in chief part from the deeply-seated error of considering the physical conditions of a country as the most important; whereas it cannot be disputed that the nature of the other species with which each has to compete, is at least as important, and generally a far more important element of success.
Página 140 - The periodic law, based as it is on the solid and wholesome ground of experimental research, has been evolved independently of any conception as to the nature of the elements. It does not in the least originate in the idea of an unique matter, and it has no historical connection with that relic of the torments of classical thought...
Página 517 - Contributions to Meteorology : being Results derived from an examination of the Observations of the United States Signal Service, and from other sources.
Página 139 - ... phenomena was always found to be proportional to the mass, and in no case was an increase of mass followed by a recurrence of properties such as is disclosed by the periodic law of the elements. This constituted such a novelty in the study of the phenomena of nature that, although it did not lift the veil which conceals the true conception of mass, it nevertheless indicated that the explanation of that conception must be searched for in the masses of the atoms ; the more so, as all masses are...
Página 138 - ... 4. The elements which are the most widely diffused have small atomic weights. 5. The magnitude of the atomic weight determines the character of the element, just as the magnitude of the molecule determines the character of a compound body.
Página 426 - ... our northeast storms in North America begin first, in point of time, in the southwest parts; that is to say, the air in Georgia, the farthest of our colonies to the southwest, begins to move southwesterly before the air of Carolina, which is the next colony northeastward ; the air of Carolina has the same motion before the air of Virginia, which lies still more northeastward; and so on northeasterly through Pennsylvania, New York, New England, &c., quite to Newfoundland. These northeast storms...
Página 512 - Sheep extra, f 1 00. Loomis's Elements of Plane and Spherical Trigonometry, with their Applications to Mensuration, Surveying, and Navigation. To which is added a full Series of Tables of Logarithms of Numbers, and of Sines and Tangents for every Ten Seconds of the Quadrant.
Página 214 - NICHOLSON. A Manual of Zoology, for the use of Students. With a General Introduction on the Principles of Zoology. By HENRY ALLEYNE NICHOLSON, MD, D.Sc., FLS, FGS, Regius Professor of Natural History in the University of Aberdeen.
Página 166 - But the Silurian, though ancient, are not, as before stated, the most ancient fossiliferous strata. They are in truth but the upper portion of a succession of early deposits which it may hereafter be found necessary to describe under one comprehensive name. For this purpose I venture to suggest the term 'Protozoic Rocks,' thereby to imply the first or lowest formations in which animals or vegetables appear...
Página 518 - ... meteorology, being results derived from an examination of the observations of the United States Signal Service and from other sources — 10th paper.