The American Journal of ScienceJ.D. & E.S. Dana, 1886 |
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Altres edicions - Mostra-ho tot
Frases i termes més freqüents
acid actinolitic analysis angles Annealed appears augite axis beds biotite bolometer Cambrian cancrinite Cañon carbon cent character chemical chlorite color comet containing copper County crystalline crystals curve deposits described determined Devonian diameter evidence fact fauna feet feldspar figures formation fossils fragments genera genus geological gives glaciers glass grains heat hornblende inch iron Journal Lake latter lavas layers lepidolite less limestone lower magnetic magnetite mass maximum measured metamorphic meteorite meteoroids meteors mica miles mineral mountains movement nearly observed obtained occur octahedral octahedron olivine original oxide paper parallel peridotite planes plates portion position Potsdam precipitate present prism probably Professor quartz region River rocks sandstone schists SCI.-THIRD SERIES seen shales shown side silica Silurian solution species specimens spectrum spherometer steel strata structure surface Taconic temperature tendril thickness tion Triassic tube upper velocity wave-length
Passatges populars
Pàgina 3 - A Catalogue of Plants growing without Cultivation within Thirty Miles of Amherst College* (1875) ; and 'A Synopsis of North American Lichens, Part I.* (1882).
Pàgina 397 - Do not the vast masses of basalt, the general appearances of mountain ranges, the violent distortions and fractures of strata, the great prevalence of metamorphic action (which must have taken place at depths of not many miles if so much), all agree in demonstrating that the rate of increase of temperature downwards must have been much more rapid, and in rendering it probable that volcanic energy, earthquake shocks, and every kind of so-called Plutonic action, have been, on the whole, more abundantly...
Pàgina 404 - ... is one, two, three or four divisions; and the approach to or retreat from, the neutral line deciding the electro-negative or electro-positive character of the element — all on the retreating half of the swing being positive and all on the approaching half negative — this oscillating force must be intimately connected with the imponderable matter, essence or source of energy we call electricity.
Pàgina 390 - ... years to remove one foot of rock from the general surface of a river basin. From a consideration of the denuding power of rivers, and a measurement of the thickness of stratified rock, Phillips has made an estimate of the period of time comprised in geological history, and finds that, from stratigraphical evidence alone, we may regard the antiquity of life on the earth as being possibly between 38 and 96 millions of years f.
Pàgina 434 - Staley bridge to Burnley and thence to Skipton in Yorkshire. Northeast of Burnley it is banked against the Boulsworth hills up to a height of 1300 feet in the form of mounds and hummocks. South and east of this long moraine no signs of glaciation were discovered, while north and west of it there is every evidence of a continuous ice-sheet covering land and sea alike. The...
Pàgina 399 - And when finally we consider underground temperature we find ourselves driven to the conclusion that the existing state of things on the earth, life on the earth, and all geological history showing continuity of life, must be limited within some such period of past time as one hundred million years.
Pàgina 360 - ... zoological classification that were the subjects of thought and discussion, and became profoundly impressed thereby, as his later work shows. From Carlsruhe, Guyot went to Stuttgart and took the course at the gymnasium, where he made himself a proficient in the German language. Returning to Neuchatel in 1827, and there quickened in his religious faith and feelings by the preaching of the Rev.
Pàgina 398 - It seems therefore, on the whole, most probable that the sun has not illuminated the earth for 100,000,000 years, and almost certain that he has not done so for 500,000,000 years. As for the future, we may say with equal certainty that inhabitants of the earth cannot continue to enjoy the light and heat essential to their life for many million years longer, unless new sources, now unknown to us, are prepared in the great storehouse of Creation.
Pàgina 19 - A Catalogue of the Native and Naturalized Plants of the City of Buffalo and Its Vicinity.
Pàgina 363 - Guyot, who hesitated at accepting his views without examination, to study the facts, and obtained the promise that he would visit the glaciers that summer. In his memoir of Agassiz, Guyot states that his six weeks of investigation that season in the Central Alps (nearly two years before Agassiz commenced his investigations on the Glacier of the Aar) were fruitful beyond expectation.