The American Naturalist, Band 5Essex Institute, 1872 |
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Häufige Begriffe und Wortgruppen
abundant Amer American animals appear beds bees birds bones Cambrian carbonate Carboniferous cave cells character chlorite coal coast color containing cotyledons Cretaceous Crustacea crystalline schists crystals deposits described developed distinct Drift eggs Emmons examined existence fact fauna feet fish flowers formation fossil genera genus geodes Geol geological geologists gneiss Green Mountains hornblende hundred Huronian inches insects Jour known larva larvæ latter Lepidoptera less limestone magnesian mass microscope mineral Museum Natural History NATURALIST nearly nest Neuroptera North observed organs origin paleozoic peculiar perithecia plants pollen portion Potsdam present probably Prof Professor pseudomorphism Quito referred regard region remarkable represented resemblance river rocks sandstone schists sediments seen serpentine shells side silicates Silurian similar species specimens spores steatite strata structure supposed surface Taconic Tertiary thick tion upper valley wings
Beliebte Passagen
Seite 453 - Champlain, the Green Mountains of Vermont, and the White Mountains of New Hampshire. The...
Seite 605 - ... the influence of various kinds of compulsion in the lower, and intelligent option among higher animals. ' Thus intelligent choice, taking advantage of the successive evolution of physical conditions, may be regarded as the originator of the fittest, while natural selection is the tribunal to which all the results of accelerated growth are submitted. This preserves or destroys them, and determines the new points of departure on which accelerated growth shall build.
Seite 706 - ... by the human race. All this goes to show and cannot be too much insisted upon, that the relative capacity of the skull is to be considered merely as an anatomical and not as a physiological characteristic, and unless the quality of the brain can be represented at the same time as the quantity, brain measurement cannot be assumed as an indication of the intellectual position of races any more than of individuals.
Seite 3 - God has suspended Here on its fragile stalk, to direct the traveller's journey Over the sea-like, pathless, limitless waste of the desert.
Seite 572 - Elm leaves have the inner or upper side much larger," thus upsetting De Candolle's theory that the inequality is due to the position of the le%af upon the stem. Various other reasons have been assigned for this inequality, all of which seem to fail when applied to numerous examples in their various stages of development. Schleiden believes that this want of symmetry is due to unequal pressure in the bud. Spencer seems in doubt about the true cause, for he says, " How far such differences are due...
Seite 478 - American rocks, and is the true explanation of many supposed examples of passage from crystalline schists to uncrystalline sediments. The Anglesea rocks are a highly inclined and much contorted series of quartzose, micaceous, chloritic, and epidotic schists, with diorites, and dark-colored chromiferous serpentines, all of which, after a careful examination of them in the collections of the Geological Survey of Great Britain, appear to me identical with the rocks of the Green Mountain, or Huronian...
Seite 385 - The objects of the Association are, by periodical and migratory meetings, to promote intercourse between those who are cultivating science in different parts of...
Seite 506 - Deville, namely, the action of vapors of anhydrous magnesian chlorid on heated carbonate of lime, in accordance with Von Buch's strange theory of dolomitization, I have not thought necessary to submit to the test of experiment, since the conditions required are scarcely conceivable in nature. Multiplied geognostical observations show that the notion of the epigenic production of dolomite from limestone is untenable, although its resolution and deposition in veins, cavities, or pores in other rocks...
Seite 501 - ... is, moreover, well known. It was, therefore, that, after a careful study of these ancient rocks, I declared in May, 1858, that a great mass of evidence " points to the existence of organic life, even during the Laurentian, or socalled azoic period." * This prediction was soon verified in the discovery of the Eozoon Canadense, of Dawson, the organic character of which is now admitted by all zoologists and geologists of authority. But with this discovery appeared another fact, which afforded a...
Seite 493 - Subsequently, in 1860, I combated the view of Bischof, adopted by Dana, that " regional metamorphism is pseudomorphism on a grand scale," in the following terms : — "The ingenious speculations of Bischof and others, on the possible alteration of mineral species by the action of various saline and alkaline solutions, may pass for what they are worth, although we are satisfied that by far the greater part of the so-called cases of pseudomorphism in silicates are purely imaginary, and, when real,...