The American Naturalist, Volumen 6Essex Institute, 1872 |
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Otras ediciones - Ver todo
Términos y frases comunes
abundant Academy allied Amblyopsis AMER American angular aperture animals appear Asa Gray Baird beds birds blind fish bones Botany carboniferous cells character coast collection color common containing Cope Cretaceous Crustacea described diameter eggs Elliott Coues elytra eyes fact feet female flowers fossil genera genus geological give glacial glass habits head hundred inches Indian insects interesting island Journal known Lake large number larva larvæ leaves length lens less male Mammoth Cave mass microscope miles mountains Museum Natural History NATURALIST nearly North noticed O. C. Marsh object observed obtained organs pamph paper peculiar plants plate portion present probably Prof region remarkable represented River ROBERT RIDGWAY rocks root-lice Science seems seen shore side species specimens stomata streams surface Taxodium tion trees valley vegetation vines wings Wyandotte Cave Zoology
Pasajes populares
Página 578 - I have seen the trees diminish in number, give place to wide prairies, restrict their growth to the borders of streams, and then disappear from the boundless drier plains; have seen grassy plains change into a brown and sere desert, — desert in the common sense, but hardly anywhere botanically so ; have seen a fair growth of coniferous trees adorning the more favored slopes of a mountain range high enough to compel summer showers; have traversed that broad and bare elevated region shut off on both...
Página 97 - From the middle of the seventeenth century and during the first half of the eighteenth century the state thus struggled to gain control of copper and quicksilver, the key export products of the monarchy.
Página 593 - Very similar would seem to have been the fate of a more familiar gymnospermous tree, the Gingko or Salisburia. It is now indigenous to Japan only. Its ancestor, as we may fairly call it, since, according to Hcer, " it corresponds so entirely with the living species that it can scarcely be separated from it...
Página 589 - This was before Heer had developed the rich fossil botany of the arctic zone, before the immense antiquity of existing species of plants was recognized, and before the publication of Darwin's now famous volume on the
Página 593 - ... corresponds so entirely with the living species that it can scarcely be separated from it," — once inhabited Northern Europe, and the whole arctic region round to Alaska, and had even a representative farther south, in our Rocky Mountain district. For some reason, this and Glyptostrobus survive only on the shores of Eastern Asia.
Página 15 - ... on the bottom. They must take much of their food near the surface, as the life of the depths is apparently very sparse. This habit is rendered easy by the structure of the fish, for the mouth is directed partly upwards, and the head is very flat above, thus allowing the mouth to be at the surface.
Página 59 - In a paper read before the Geological Section of the British Association, at the Plymouth meeting, last August, Mr.
Página 86 - ... fire, and hide in the grass; for, if they perceive the one who fired, they rush on him and attack him. As their feet are large and rather short, they do not generally go very fast, except when they are irritated. They are scattered over the prairies like herds of cattle. I have seen a band of four hundred. We advanced constantly, but as we did not know where we were going...
Página 15 - They are then easily taken by the hand or net, if perfect silence is preserved, for they are unconscious of the presence of an enemy except through the medium of hearing. This sense is, however, evidently very acute, for at any noise they turn suddenly downward and hide beneath stones, &c., on the bottom.
Página 418 - Wyandotte cave no such connection is known to exist. Access by water is against the current of small streams which discharge from it. On this basis rests an animal life which is limited in extent and must be subject to many vicissitudes. Yet a fuller examination will probably add to the number of species and of these, no doubt, a greater or less number of parasites on those already known. The discovery of the little...