The American Naturalist, Volume 9Essex Institute, 1875 |
Conteúdo
| 1 | |
| 21 | |
| 37 | |
| 56 | |
| 65 | |
| 87 | |
| 122 | |
| 129 | |
| 385 | |
| 410 | |
| 426 | |
| 433 | |
| 450 | |
| 470 | |
| 481 | |
| 498 | |
| 147 | |
| 160 | |
| 184 | |
| 205 | |
| 218 | |
| 253 | |
| 257 | |
| 274 | |
| 311 | |
| 316 | |
| 321 | |
| 375 | |
| 516 | |
| 529 | |
| 575 | |
| 577 | |
| 583 | |
| 625 | |
| 632 | |
| 658 | |
| 665 | |
| 667 | |
Outras edições - Ver todos
Termos e frases comuns
abdomen abundant Acad adult Agassiz alimentary animals Annelides antennæ appear appendages arise ascidians Balanoglossus becomes birds blastoderm body bones Brachiopods budding canal Cave Cedar City cells cephalothorax ciliated color Crustacea diameter digestive cavity Echinoderms ectoderm eggs embryo ergot F. W. PUTNAM fact feet figure fishes fossil gastrula genera genus Geological germ germ-layer grains Gray growth hatching head inches Infusoria insects intestine Kowalevsky large number larva larvæ layer length less limestone lower mass maxillæ membrane Metschnikoff Microscopical mode mollusks Morula mound Mountains mouth Museum natural NATURALIST Nauplius nearly nucleus observed organs outer pairs pass plants planula polypide portion present primitive probably Proc Prof region represents resembles rocks Rocky seeds seen shell side skull slender species specimens spores stage starch suckers surface swimming tail teeth tentacles tion Torr tube upper vertebrates Watson worms yolk young
Passagens mais conhecidas
Página 482 - The thing that hath been, it is that which shall be; and that which is done is that which shall be done : and there is no new thing under the sun. Is there anything whereof it may be said, See, this is new? it hath been already of old time, which was before us.
Página 419 - But if this principle be true, it is far from meeting the requirements of the "law" of this article. The writer of it may have had in his mind a vague idea of the law of Von Baer, which is well known, and which has enabled naturalists "to correct their systems of classification," viz. : "That, in its earliest stages, every organism has the greatest number of characters in common with all other organisms, in their earliest stages.
Página 262 - That the ancient seams of coal were produced for the most part by terrestrial plants of all sizes, not drifted, but growing on the spot, is a theory more and more generally adopted in modern times ; and the growth of what is called sponge in such a swamp, and in such a climate as the Great Dismal, already covering so many square miles of a low level region bordering the sea, and capable of spreading itself indefinitely over the adjacent...
Página 552 - Palaeontology furnishes no direct evidence, perhaps never can furnish any, as to the actual transformation of one species into another, or as to the actual circumstances of creation of a species, but the drift of its testimony is to show that species come in per saltum, rather than by any slow and gradual process.
Página 547 - ... succumbs to death and its substance returns into inorganic nature, a law from which even the longer life of the species does not seem to exempt it. All this is so plain and manifest that it is extraordinary that evolutionists will continue to use such partial and imperfect arguments. Another illustration may be taken from that application of the doctrine of natural selection to explain the introduction of species in geological time, which is so elaborately discussed by Sir C. Lyell in the last...
Página 530 - ... the past duration of the earth be finite, then the aggregate of geological epochs, however numerous, must constitute a mere moment of the past, a mere infinitesimal portion of eternity.
Página 68 - Rathke's canals have no existence, and what have been taken for them are simply passages, or seinicauals, between the proper ventral wall of the abdomen and the incurved edges of two ridges developed at the junction of the ventral with the lateral faces of the body, which extend from behind the abdominal pore where they nearly meet, to the sides of the mouth. Doubtless the ova which...
Página 496 - ... a man of science, for within his domain of investigation it does not belong. With regard to the accessories of traditions, interpretations, etc., our answer may be clearer, when we have briefly reviewed some recent events in what has been written about as the Conflict of Religion and Science. Some centuries ago, great theological disgust was produced by the announcement that the sun and not the earth was the centre of the planetary system. A few decades ago profound dissatisfaction was shown...
Página 485 - Ammodonus fossor, a wingless Tenebrionide, Trenton, seashore near New York, and valley of Mississippi at St. Louis ; thus nearly approximating Cicindela lepida in distribution. We can thus obtain by a careful observation of the localities of insects, especially such as affect seashore or marsh, and those which being deprived of their favorite surroundings, have shown, if I may so express myself, a patriotic clinging to their native soil, most valuable indications in regard to the time at which their...
Página 447 - to assume the horse-shoe-shaped form of Pectinatella and other high Polyzoa. The mouth at this stage begins to turn towards the dorsal valve (ventral of authors), and as the central lobes of the lophophore begin to develop, the lateral arms are deflected as in F. In these stages...