The Shipley Collection of Scientific Papers, Том 231897 |
Результаты поиска по книге
Результаты 1 – 5 из 100
Стр. 493
... entoblastic invagination was incomplete , leaving the " Urmund " of Kollmann open . This " Urmund ” is homologous with a circular opening which might be produced by a rupture near the center of the inflected entoblast of the gastrula of ...
... entoblastic invagination was incomplete , leaving the " Urmund " of Kollmann open . This " Urmund ” is homologous with a circular opening which might be produced by a rupture near the center of the inflected entoblast of the gastrula of ...
Стр.
... entoblastic cells ofthe allantoic diverticulum, oreven among these entoblastic cells. Several authors have reported this origin inman, without, however, beingable to establish that these cells are directly derived from the entoblast ...
... entoblastic cells ofthe allantoic diverticulum, oreven among these entoblastic cells. Several authors have reported this origin inman, without, however, beingable to establish that these cells are directly derived from the entoblast ...
Стр. 139
... entoblastic cells as compared with the earlier stages . The space which in most of the earlier stages was filled with small cells is now filled with large yolk masses with a few smaller cells scattered among them . It is possible that ...
... entoblastic cells as compared with the earlier stages . The space which in most of the earlier stages was filled with small cells is now filled with large yolk masses with a few smaller cells scattered among them . It is possible that ...
Стр. 339
... entoblastic . At the next cleavage in Crepidula the large cells Me1 , Me2 , which still contain both mesoblast and entoblast , give off smaller purely mesoblastic cells anteriorly ( m ' , m2 ) , while in Fiona the larger posterior cells ...
... entoblastic . At the next cleavage in Crepidula the large cells Me1 , Me2 , which still contain both mesoblast and entoblast , give off smaller purely mesoblastic cells anteriorly ( m ' , m2 ) , while in Fiona the larger posterior cells ...
Стр. 524
... (entoblastic). From the facts above addnced, it may be conclnded that both the anterior diverticnla and the ventral groore, present at a eertain developmental stage of the Phoronis embryos, are remnants of the original mesentoblast which ...
... (entoblastic). From the facts above addnced, it may be conclnded that both the anterior diverticnla and the ventral groore, present at a eertain developmental stage of the Phoronis embryos, are remnants of the original mesentoblast which ...
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
Популярные отрывки
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...