The American Journal of Science, Volumen67J.D. & E.S. Dana, 1854 |
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Página 22
... regard it as the more highly metamorphosed portions of the dark - green chlorite slates . This compact hornblende is not to be confounded with those lenticular - shaped masses observed in the slates , which , we doubt not , are trappean ...
... regard it as the more highly metamorphosed portions of the dark - green chlorite slates . This compact hornblende is not to be confounded with those lenticular - shaped masses observed in the slates , which , we doubt not , are trappean ...
Página 32
... regard the question of the age of this rock as settled - that the Potsdam sandstone of New York is identical with that of the Mississippi and the St. Croix . One great source of doubt and perplexity in its determination , here- tofore ...
... regard the question of the age of this rock as settled - that the Potsdam sandstone of New York is identical with that of the Mississippi and the St. Croix . One great source of doubt and perplexity in its determination , here- tofore ...
Página 61
... regard to the most distant , to trace the enormous interval . But after all , what is all this , vast as the attainment may seem , in the exploration of the extent of the works of the Almighty ? For in this attempt to look into space ...
... regard to the most distant , to trace the enormous interval . But after all , what is all this , vast as the attainment may seem , in the exploration of the extent of the works of the Almighty ? For in this attempt to look into space ...
Página 65
... regard the vitellus - looking mass as the mucous , and the germ - mass proper as the serous fold of the germinating tissue , as in true eggs - if , I repeat , we can ad- mit this comparison of parts , then the analogy of development ...
... regard the vitellus - looking mass as the mucous , and the germ - mass proper as the serous fold of the germinating tissue , as in true eggs - if , I repeat , we can ad- mit this comparison of parts , then the analogy of development ...
Página 69
... regard them as buds , true gemmæ , which sprout from the inner surface of the Aphis , exactly like the buds from the external skin of a Polyp.t Before proceeding to a discussion of the relations of this im- portant conclusion to which ...
... regard them as buds , true gemmæ , which sprout from the inner surface of the Aphis , exactly like the buds from the external skin of a Polyp.t Before proceeding to a discussion of the relations of this im- portant conclusion to which ...
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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 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...