The Shipley Collection of Scientific Papers, Том 231897 |
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Стр. 909
... importance of the frequent occurrence of imperfect individuals is increased by bearing in mind that reproduction of lost parts may take place at any of the several ecdyses and that , as has been ascertained by observation , when once a ...
... importance of the frequent occurrence of imperfect individuals is increased by bearing in mind that reproduction of lost parts may take place at any of the several ecdyses and that , as has been ascertained by observation , when once a ...
Стр. 2
... importance for the general problems of cell - lineage even greater than its interest for the more special problems of annelid em ... important datum for the estimation of the cell - theory as applied to development . The results of a re ...
... importance for the general problems of cell - lineage even greater than its interest for the more special problems of annelid em ... important datum for the estimation of the cell - theory as applied to development . The results of a re ...
Стр. 9
... the archenteron is however a sur- prising result ; and it is , therefore , highly important to make certain , first whether the pigment - cells are in CELL - LINEAGE . 9 be followed of the progressive inwandering of the pigment-...
... the archenteron is however a sur- prising result ; and it is , therefore , highly important to make certain , first whether the pigment - cells are in CELL - LINEAGE . 9 be followed of the progressive inwandering of the pigment-...
Стр. 11
... important discoveries in the gasteropod Crepidula . Conklin here definitely showed , for the first time in any animal , 2 that the so - called " primary mesoblasts " give rise to a group of entoblast - cells before dividing to form the ...
... important discoveries in the gasteropod Crepidula . Conklin here definitely showed , for the first time in any animal , 2 that the so - called " primary mesoblasts " give rise to a group of entoblast - cells before dividing to form the ...
Стр. 23
... importance and compactness in the course of evolu- tion . Then this new structure may be represented in ontogeny by a cell . But the form of cleavage is already defined . The manufacture of a new cell be- * * * ing an impossibility , an ...
... importance and compactness in the course of evolu- tion . Then this new structure may be represented in ontogeny by a cell . But the form of cleavage is already defined . The manufacture of a new cell be- * * * ing an impossibility , an ...
Часто встречающиеся слова и выражения
American eggs Amphioxus animals annelids appear Appendicularia archenteron Aricia arrangement autotomy axis-cylinder process bones buds cave-earth cavern cell body cell of Helix cell-lineage cells of Invertebrates cellular centrosomes character chromophilous chromophilous granules chromosomes colonial condition curve density depth determined differentiation direction disease distilled water division ecdysis embryo entoblastic evidence existence fact fathoms fibrils FLEMMING'S foliage-leaves function ganglion cells gasteropods geological germ-plasm give granular rows ground-substance growth haematoxylin Heredity hydrometer individual investigation large number latter leaves Leptoplana mesoblast-bands mesoblasts metamorphosis method methylen blue morphological Museum naturalists Nereis nerve cells neuroglia neuroglia fibrils nucleus observations ocean offspring organs origin plant plate polyclade position posterior present primary mesoblasts produce quartet regard reproductive cells safranin segmentation segmentation nucleus slug solution species specimens spindles spiral sporophyll stained stalagmite stem structure substance surface tarsus temperature theory tion tissues variations Vertebrates
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Стр. 7 - I happened to read for amusement 'Malthus on Population', and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animals and plants, it at once struck me that under these circumstances favourable variations would tend to be preserved, and unfavourable ones to be destroyed. The result of this would be the formation of new species. Here then I had at last got a theory by which to work...
Стр. 2 - And pretty dwarfs to show the way Through fairy hills and fairy dales. But when a bad child goes to bed, From left to right she weaves her rings, And then it dreams all through the night Of only ugly horrid things ! Then lions come with glaring eyes, And tigers growl, a dreadful noise, And ogres draw their cruel knives, To shed the blood of girls and boys.
Стр. 2 - LITTLE fairy comes at night, Her eyes are blue, her hair is brown, With silver spots upon her wings, And from the moon she flutters down. She has a little silver wand, And when a good child goes to bed She waves her wand from right to left, And makes a circle round its head.
Стр. 11 - human remains and works of art, such as arrow-heads and knives of flint, occur in all parts of the cave and throughout the entire thickness of the clay : and no distinction founded on condition, distribution, or relative position, can be observed, whereby the human can be separated from the •other reliquiae," which included bones of the "elephant, rhinoceros, ox, deer, horse, bear, hyaena, and a feline animal of large size.
Стр. 4 - Les noms géographiques des nations qui emploient, dans leur écriture, des caractères latins (langues néo-latines, germaniques, Scandinaves), seront écrits avec l'orthographe de leur pays d'origine. Les règles qui vont suivre s'appliquent uniquement aux noms géographiques de pays qui n'ont point d'écriture propre ou qui écrivent avec des caractères différents des caractères latins. Toutefois, à titre exceptionnel, on conservera l'orthographe usitée pour les noms de lieux, lorsqu'elle...
Стр. 8 - It may well be doubted ; and yet one is always the better for a walk in the morning air, — a medicine which may be taken over and over again without any sense of sameness, or any failure of its invigorating quality.
Стр. 12 - Whatever other causes have been at work, natural selection is supreme, to an extent which even Darwin himself hesitated to claim for it. The more we study it the more we are convinced of its overpowering importance, and the more confidently we claim, in Darwin's own words, that it ' has been the most important, but not the exclusive, means of modification...