The Shipley Collection of Scientific Papers, Volumen231897 |
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Página 21
... larval mesenchyme " of the annelids which he believes to have a different origin from the mesoblast - bands . 2 Cf. Lang , 1884 , Figs . 17-20 . 3 1897 , p . 289 . one noteworthy respect , namely , that the division of CELL - LINEAGE . 21.
... larval mesenchyme " of the annelids which he believes to have a different origin from the mesoblast - bands . 2 Cf. Lang , 1884 , Figs . 17-20 . 3 1897 , p . 289 . one noteworthy respect , namely , that the division of CELL - LINEAGE . 21.
Página 22
one noteworthy respect , namely , that the division of the pos- terior " macromere " is variable , only rarely dividing equally ( Fig . 6 , F ) and as a rule dividing unequally , giving rise to a smaller cell ( 4d2 , Fig . 6 , E ) that ...
one noteworthy respect , namely , that the division of the pos- terior " macromere " is variable , only rarely dividing equally ( Fig . 6 , F ) and as a rule dividing unequally , giving rise to a smaller cell ( 4d2 , Fig . 6 , E ) that ...
Página 42
... namely , ( 1 ) the interval elapsing before the first response to gravity occurred , and ( 2 ) the interval required for the animal to place its entire axis in a vertical position . The results gained are given in Table I. The times ...
... namely , ( 1 ) the interval elapsing before the first response to gravity occurred , and ( 2 ) the interval required for the animal to place its entire axis in a vertical position . The results gained are given in Table I. The times ...
Página 16
... namely , an independent life , that is , it possesses its individual energy . I maintain a perfect individuality or independence of the cellular life , in opposition to all the cell theories , but , pro- ceeding logically , I can not ...
... namely , an independent life , that is , it possesses its individual energy . I maintain a perfect individuality or independence of the cellular life , in opposition to all the cell theories , but , pro- ceeding logically , I can not ...
Página 29
... namely , of fibrils , and of an interfibrillar substance . Each of these elements stain differently when treated by the method of VIALLANES ; the fibrils stain blue and the interfibrillar substance red . If I understand him correctly ...
... namely , of fibrils , and of an interfibrillar substance . Each of these elements stain differently when treated by the method of VIALLANES ; the fibrils stain blue and the interfibrillar substance red . If I understand him correctly ...
Términos y frases comunes
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
Pasajes populares
Página 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...
Página 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.
Página 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.
Página 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.
Página 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...
Página 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.
Página 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...