The Canadian Naturalist and Geologist, Том 5Dawson., 1860 |
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Стр. 51
... convex or only slightly elevated throughout the greater part of its extent . In the upper half of the shell it is bounded by the depressions that have been mentioned as existing between the umbo and cardinal . angles , but in front and ...
... convex or only slightly elevated throughout the greater part of its extent . In the upper half of the shell it is bounded by the depressions that have been mentioned as existing between the umbo and cardinal . angles , but in front and ...
Стр. 53
... convex or nearly straight for about one third the width in the middle portion . Width on hinge - line from nine to twelve lines . Length from six to eight lines . The beak , umbo , depressions on each side of the umbo and the cardinal ...
... convex or nearly straight for about one third the width in the middle portion . Width on hinge - line from nine to twelve lines . Length from six to eight lines . The beak , umbo , depressions on each side of the umbo and the cardinal ...
Стр. 54
... convex- ity . In some specimens it is depressed convex , and these have almost precisely the aspect of the more flattened forms of S. al- ternata . Others are strongly convex , nearly hemispherical , uni- formly arched from beak to ...
... convex- ity . In some specimens it is depressed convex , and these have almost precisely the aspect of the more flattened forms of S. al- ternata . Others are strongly convex , nearly hemispherical , uni- formly arched from beak to ...
Стр. 55
... convex and nearly uniformly arched from beak to front ; the umbo well defined , but the concave depressions on each side rather obscure ; no deflected margin . The large specimens ( nine lines wide ) are sometimes strongly convex ...
... convex and nearly uniformly arched from beak to front ; the umbo well defined , but the concave depressions on each side rather obscure ; no deflected margin . The large specimens ( nine lines wide ) are sometimes strongly convex ...
Стр. 56
... convex than S. Ceres . Locality and Formation . - Anticosti , in strata situated from 800 to 1000 feet above the base of the Middle Silurian , and 250 feet below the rocks containing Pentamerus oblongus . Collector . - J . Richardson ...
... convex than S. Ceres . Locality and Formation . - Anticosti , in strata situated from 800 to 1000 feet above the base of the Middle Silurian , and 250 feet below the rocks containing Pentamerus oblongus . Collector . - J . Richardson ...
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Часто встречающиеся слова и выражения
abundant angle animals aperture appears Arisaig August beak beds Bevin's Lake birds Boisd Canada Canadian carboniferous coal collection common convex copper curved deposits Devonian diameter Dikelocephalus distance Distribution.-New York dorsal Doubleday Eastern Townships elevated end of Lake feet Forewings Fort Vancouver fossils front Gaspé Genus geological glabella Guén half Hamilton's Farm head inch Island July June Lake Winnipeg larvæ lava Lawrence length limestone lines lobes margin marked miles Montcalm Montreal mountain Murray Bay Natural History Naturalist nearly neck furrow neck segment Nova Scotia obliquely observed occur Orillia plants posterior present Prof pygidium resembles ridge River River Rouge rocks rounded sandstone seam seen shale shell side Silurian siphuncle slightly Society Sorel species specimens strata striæ Sugar-bush Lake surface thickness tion transverse trees umbilicus upper ventral valve Walker whorl width wings woods
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Стр. 458 - THE GLACIERS OF THE ALPS : being a Narrative of Excursions and Ascents. An Account of the Origin and Phenomena of Glaciers, and an Exposition of the Physical Principles to which they are related.
Стр. 119 - Analogy would lead me one step further, namely, to the belief that all animals and plants have descended from some one prototype. But analogy may be a deceitful guide. Nevertheless all living things have much in common, in their chemical composition, their germinal vesicles, their cellular structure, and their laws of growth and reproduction. We see this even in so trifling a circumstance as that the same poison often similarly affects plants and animals ; or that the poison secreted by the gall-fly...
Стр. 119 - I cannot doubt that the theory of descent with modification embraces all the members of the same great class or kingdom. I believe that animals are descended from at most only four or five progenitors, and plants from an equal or lesser number.
Стр. 71 - ... caves have been inhabited by a succession of tenants, and have been selected by man as a place not only of domicile, but of sepulture, while some caves have also served as the channels through which the waters of...
Стр. 118 - It may be asked how far I extend the doctrine of the modification of species. The question is difficult to answer, because the more distinct the forms are which we consider, by so much the arguments in favour of community of descent become fewer in number and less in force. But some arguments of the greatest weight extend very far. All...
Стр. 70 - No subject has lately excited more curiosity and general interest among geologists and the public than the question of the antiquity of the human race ; whether or no we have sufficient evidence to prove the former co-existence of man with certain extinct mammalia, in caves or in the superficial deposits commonly called drift or
Стр. 403 - Without asserting that every part of the theory had been confirmed, he maintained that it was the best explanation of the origin of species which had yet been offered. With regard to the psychological distinction between man and animals; man himself was once a monad — a mere atom, and nobody could say at what moment in the history of his development he became consciously intelligent.
Стр. 74 - ... races and permanent varieties in animals and plants, are the same as those which, in much longer periods, produce species, and, in a still longer series of ages, give rise to differences of generic rank. He appears to me to have succeeded, by his investigations and reasonings...
Стр. 47 - Makrede and one or two others, all belonging either to the genus Bagrus or one nearly allied to it. The first two are quite common in the market and I have seen many specimens of them ; for the last two I have the authority of negro fishermen but have never seen them myself. The eggs in my collection are of three different sizes, indicating so many species ; one of the three having been brought to me without the fish from which they were taken. The eggs become quite large before they leave the ovaries,...
Стр. 181 - ... simply because it was so probable that the operation would be followed by a fatal issue, that I wished to prepare for death and what lies beyond it, whilst my faculties were clear and my emotions were comparatively undisturbed, for I knew well that if the operation were speedily followed by death, I should be in a condition, during the interval, in the last degree unfavourable to making preparation for the great change.