The American Journal of Science, Volumen67J.D. & E.S. Dana, 1854 |
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Página 16
... nearly twelve hundred feet above Lake Superior or eighteen hundred feet above the ocean - level . We commence our description of the local phenomena of this system of rocks where they intersect the lake shore between Ri- viere du Mort ...
... nearly twelve hundred feet above Lake Superior or eighteen hundred feet above the ocean - level . We commence our description of the local phenomena of this system of rocks where they intersect the lake shore between Ri- viere du Mort ...
Página 17
... nearly the whole geology of the district . The quartz zone exhibits two distinct ridges , where it ap- proaches the lake , hemming in the valley of Carp river with rocky walls , from two to six hundred feet in height . As we trace it ...
... nearly the whole geology of the district . The quartz zone exhibits two distinct ridges , where it ap- proaches the lake , hemming in the valley of Carp river with rocky walls , from two to six hundred feet in height . As we trace it ...
Página 18
... nearly east and west . De la Beche , in reference to the greenstones and schistose rocks of Bossiney , Cornwall , remarks that , " there is so intimate a mix- ture of compact and schistose trappean rocks with the argillaceous that the ...
... nearly east and west . De la Beche , in reference to the greenstones and schistose rocks of Bossiney , Cornwall , remarks that , " there is so intimate a mix- ture of compact and schistose trappean rocks with the argillaceous that the ...
Página 22
... nearly hori- zontal position , as when first deposited , they would require a far greater space than they now occupy . The causes by which these foldings have been effected , will be discussed in a subse- quent chapter . We have thus ...
... nearly hori- zontal position , as when first deposited , they would require a far greater space than they now occupy . The causes by which these foldings have been effected , will be discussed in a subse- quent chapter . We have thus ...
Página 25
... nearly horizontally on the basset edges of the slates , or occupy the depressions in the granite . This general remark , however , must be received with some qualification , for we find that there existed , during a part of the ...
... nearly horizontally on the basset edges of the slates , or occupy the depressions in the granite . This general remark , however , must be received with some qualification , for we find that there existed , during a part of the ...
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Términos y frases comunes
acid anal angle animals appears Arago atomic weights auroral auroral light azoic beds Berzelius body carbon Chabazite character chlorine color compounds contain crystalline crystals cylinder deposits described diameter distinct dorsal elements Esox examination fact feet feldspar fishes flora formation formula fossils genera genus geological glass globules hail heat hornblende hydrogen Idocrase inches iron islands isomorphism known Lake Lake Superior less light lime limestone lines lower magnetic Malpighian body mass metal microscope miles mineral natural nearly object observed obtained occur organic oxyd oxygen peculiar plane plants portion potash present prism Prof quartz Rafinesque ratio regard relation remarkable resembles river rocks sandstone Scapolite SECOND SERIES seen side silica Silurian slates species specific gravity specimens stones strata structure substance sulphur surface temperature thickness tion Tourmaline traced true tube upper viviparous whole Wolffian bodies XVII Zealand
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Página iii - Report on the geology of the Lake Superior land district : by JW Foster and JD Whitney, United States Geologists. Part II.
Página 99 - The Cell : its Physiology, Pathology, and Philosophy, as deduced from original investigations ; to which is added its history and criticism," extending over one hundred and eighty-eight pages, both of them fully illustrated by appropriate wood-cuts.
Página 379 - In the chick no traces of the kidney are perceptible, according to my own observations, until the end of the fourth or the beginning of the fifth day. The ureter, then, is the part first seen, and consists of a simple tube, the upper part of which sends off branches.
Página 452 - Outlines of a Mechanical Theory of Storms, containing the true [?] law of lunar influence, with practical...
Página 175 - As these soundings are believed to be the deepest ever submitted to microscopic examination, and were obtained at localities far remote from those previously noticed, they were studied very carefully, and the following are the facts ascertained : — 1. None of these soundings contain a particle of gravel, sand, or other recognizable unorganized mineral matter. 2. They all agree in being almost entirely made up of the calcareous shells of minute, or microscopic...
Página 62 - When these germs have reached the size of 30^th of an inch in diameter, there appears on each, near one end, a yellowish vitelluslooking mass or spot, which is composed of large yellowish cells, which in size and general aspect are different from those constituting the germ proper. This yellow mass increases part passu with the germ, and at last lies like a cloud over and concealing one of its poles.
Página 136 - Schyf, or mill, which revolves from two thousand to three thousand times per minute. The diamond is fixed in a ball of pewter at the end of an arm, resting upon the table in which the plate revolves ; the other end, at which the ball containing the diamond is fixed, is pressed upon the wheel by moveable weights at the discretion of the workman.
Página 74 - Aphides cannot be said to constitute as many true generations any more than the different branches of a tree can be said to constitute as many trees; on the other hand, the whole suite from the first to the last constitute but a single true generation.
Página 22 - Murchison and de Verneuil,* that the lowest beds in Scandinavia, containing the least traces of organic life, are the exact equivalents of the Lower Silurian strata of the British Isles, and that these have been distinctly formed out of, and rest upon, slaty and other rocks which had undergone crystallization before their particles were ground up and cemented together again to compose the earliest beds in which organic life is traceable. To this most ancient system of rocks in Scandinavia, they have...
Página 220 - ... from this reasoning, that if we throw a greater quantity of light upon an object, so that more may be collected by the object-glass, we shall be the better able to define its structure ; which would probably be the case if the additional light could be thrown only upon those minute parts which we wish to examine, and not upon the whole object. But as we cannot do this — as the increase of illumination cannot be made to increase the relative proportions of light which proceed from these minute...