The Annual of Scientific Discovery: Or, Year-book of Facts in Science and Art

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طبعات أخرى - عرض جميع المقتطفات

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مقاطع مشهورة

الصفحة 348 - ... coprolites, and human objects, was agglutinated to the roof by the infiltration of water holding lime in solution. That subsequently, and within the human period, such a great amount of change took place in the physical configuration of the district as to have caused the cave to be washed out and emptied of its contents, excepting the patches of material cemented to the roof and since coated with additional stalagmite.
الصفحة 330 - ... has to maintain against the surrounding agencies that are ever tending to dissolve the vital bond and subjugate the living matter to the ordinary chemical and physical forces. Any changes, therefore, in such external...
الصفحة 330 - ... of any gradual diminution of the size — of such species, but is the result of circumstances which may be illustrated by the fable of the " Oak and the Reed ;" the smaller and feebler animals have bent and accommodated themselves to changes to which the larger species have succumbed.
الصفحة 330 - ... the species. If a dry season be gradually prolonged, the large mammal will suffer from the drought sooner than the small one ; if such alteration of climate affect the quantity of vegetable food, the bulky Herbivore will first feel the effects of stinted nourishment...
الصفحة 53 - In the first, the ratio of the minor to the major axis of the ellipse is on the average as 1 to 1 25.
الصفحة 59 - ... give it a clear overfall free from the back or tail water. For any given ratio of the height of the tail water above the vertex of the notch, I would anticipate that the quantities flowing would still be, approximately at least, proportional to the...
الصفحة vii - Somme, in an area fifteen miles in length. I infer that a tribe of savages, to •whom the use of iron was unknown, made a long sojourn in this region ; and I am reminded of a large Indian mound, which I saw in St.
الصفحة 354 - Sigillarice, the variations in the leaf-scars in different parts of the trunk, the intercalation of new ridges at the surface representing that of new woody wedges in the axis, the transverse marks left by the stages of upward growth, all indicate that several years must have been required for the growth of stems of moderate size. The enormous roots of these trees, and the condition of the coal-swamps, must have exempted them from the danger of being overthrown by violence.
الصفحة vi - Fielet, so well known to you by his excellent work on Palaeontology, declared, after his visit to the spot, his adhesion to the opinions previously expressed by Aymard. My friend Mr. Scrope, in the second edition of his ' Volcanoes of Central France...
الصفحة viii - ... 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 in throwing a flood of light on many classes of phenomena connected with the affinities, geographical distribution, and geological succession of organic beings, for which no other hypothesis has been able, or has even attempted...

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