The Canadian Naturalist and Quarterly Journal of Science: With Proceedings of the Natural History Society of Montreal, Volume 4Dawson., 1869 - Geology |
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abundant Acadia acid ambulacral furrows America animals aperture appears Arctic arms Aspidium Bay of Fundy beds birds boulder clay Canada Canadensis Canadian carbonate Carboniferous central character coast collection colour common Crinoids crust Crustacean Cystidea deposits depth described Devonian dredge Echinodermata Echinoderms Entomostraca Estheria existence fathoms feet fish flora formation fossil Gaspé genera genus geological geologists Gulf Gulf of St hydrospires inches indigenous insects Island known Lake Superior larvć Lawrence limestone Linn lower Macoun matter microscopic Mollusc Montreal Mount Uniacke mountain mouth natural naturalists nearly North northern observed occur Ontario organs paleozoic paper period plants plates Platyceras Polystichum pores portion present Principal Dawson probably Prof Province Quebec recent remarkable River rocks sandstones seen shell shore side silica Silurian species specimens spinulosum strata supposed surface temperature thickness tion vault vegetation volcanic
Popular passages
Page 390 - Fear made her devils, and weak hope her gods ; Gods partial, changeful, passionate, unjust, Whose attributes were rage, revenge, or lust ; Such as the souls of cowards might conceive, And, form'd like tyrants, tyrants would believe.
Page 172 - That water intervenes not only in the phenomena of volcanic eruptions, but in the crystallization of the minerals of eruptive rocks, which have been formed at temperatures far below that of igneous fusion, is a fact not easily reconciled with either the first or the second hypothesis of volcanic action, but 'is in perfect accordance with the one here maintained, which is also strongly supported by the study of the chemical composition of igneous rocks. These are generally referred to two great divisions,...
Page 172 - The latter, as is well known, has calculated the normal composition of these supposed trachytic and pyroxenic magmas, and conceives that from them, either separately or by admixture, the various eruptive rocks are derived ; so that the amounts of alumina, lime, magnesia, and alkalies sustain a constant relation to the silica in the rock. If, however, we examine the analyses of the eruptive rocks...
Page 169 - ... strata will thus become crystallized by heat, and may eventually, with their included water, be raised to the melting point, by which process gases would be generated, and earthquakes and volcanic eruptions follow. At the same time the mechanical disturbance of the equilibrium of pressure, consequent upon a transfer of sediments, while the yielding surface reposes on matters partly liquefied, will explain the movements of elevation and subsidence of the earth's crust.
Page 174 - Fenton, who wrote in 1569, says — " There is to be found in the heads of •old and great toads a stone they call borax or stelon ;" and he adds — "They, being used as rings, give forewarning against venom.
Page 79 - cold area " were to be raised above the surface, so that the deposit at present in progress upon its bottom should become the subject of examination by some Geologist of the future, he would find this to consist of a barren Sandstone, including fragments of older rocks, the scanty Fauna of which would in great degree bear a Boreal character (§ 11); whilst if a portion of our "warm area" were elevated at the same time with the
Page 169 - WJ8 shown, might be produced all the gaseous emanations of volcanic districts, while from aqueo-igneous fusion of the various admixtures might result the great variety of eruptive rocks. To quote the words of my paper just referred to : " We conceive that the earth's solid crust of anhydrous and primitive igneous rock is everywhere deeply concealed beneath its own ruins, which form a great mass of sedimentary strata, permeated by water.
Page 314 - The improvement, which is at first rapid, gradually, after a long series of years, is diminished in amount, and eventually so far arrested that, practically speakIng, a limit to improvement in the desired quality is reached. 7. By still continuing to select, the improvement is maintained and practically a fixed type is the result.
Page 396 - Coming now to modern volcanoes, we find them in their greatest activity in oceanic regions where subsidence and accumulation are still going on. Of the two continental regions already pointed out, that along the Mediterranean basin is marked by an accumulation of mesozoic and tertiary sediments, 20,000 feet or more in thickness. It is...
Page 309 - Turaco the existence of the red colouring matter which belongs to their normal plumage is dependent upon copper, which, obtained in minute quantities with the food, is stored up in this strange manner in the system of the. animal. Thus in the very same feather, partly red and partly black, copper was found in abundance in the red parts, but none or only the merest trace in the black. This example warns us against taking too utilitarian a view of the plan of creation. Here we have a chemical substance...