The Shipley Collection of Scientific Papers, Том 231897 |
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Стр. 13
... substance ; for , although the general type of cleavage and the arrangement of the blastomeres in the polyclade shows an extraordinary re- semblance to that of the annelid or gasteropod , the cells seem not to have the same ...
... substance ; for , although the general type of cleavage and the arrangement of the blastomeres in the polyclade shows an extraordinary re- semblance to that of the annelid or gasteropod , the cells seem not to have the same ...
Стр. 26
... substance . It is , however , equally possible that the removal of the cytoplastmic substance of these cells may be a necessary condition of the differentiation of the mesoblastic material . ZOOLOGICAL LABORATORY OF COLUMBIA UNIVERSITY ...
... substance . It is , however , equally possible that the removal of the cytoplastmic substance of these cells may be a necessary condition of the differentiation of the mesoblastic material . ZOOLOGICAL LABORATORY OF COLUMBIA UNIVERSITY ...
Стр. 27
... for a tetrad bb composed of four such chromosomes is out of the dumbbell - shaped bodies of which I have spoken are aa question . The not , as WILSON seems to suppose , continuous masses of chromatic substance but 197.
... for a tetrad bb composed of four such chromosomes is out of the dumbbell - shaped bodies of which I have spoken are aa question . The not , as WILSON seems to suppose , continuous masses of chromatic substance but 197.
Стр. 28
seems to suppose , continuous masses of chromatic substance but each one consists of two distinct chromosomes connected by linin threads , and should therefore be designated by ab or any other two letters , and not , as WILSON's formula ...
seems to suppose , continuous masses of chromatic substance but each one consists of two distinct chromosomes connected by linin threads , and should therefore be designated by ab or any other two letters , and not , as WILSON's formula ...
Стр. 40
... substances in solution . If , on the other hand , the organism is a land animal capable of crawling upon a smooth surface , such as a pane of glass , the active component of gravity may be varied by altering the angle of inclination of ...
... substances in solution . If , on the other hand , the organism is a land animal capable of crawling upon a smooth surface , such as a pane of glass , the active component of gravity may be varied by altering the angle of inclination of ...
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...