The Shipley Collection of Scientific Papers, Volumen231897 |
Dentro del libro
Resultados 1-5 de 49
Página 885
... conclude , then , that there is evi- dence to prove the first proposition , viz . , in a specific case and in respect to certain characters , the operation of natural selec- tion has been suspended . For a proper discussion of ...
... conclude , then , that there is evi- dence to prove the first proposition , viz . , in a specific case and in respect to certain characters , the operation of natural selec- tion has been suspended . For a proper discussion of ...
Página 892
... conclude that the predicted results of Pan- mixia have been realized . The collection of a series of facts , for the mere support of some favorite theory , ought not to be the purpose of biological investigation . The relation that the ...
... conclude that the predicted results of Pan- mixia have been realized . The collection of a series of facts , for the mere support of some favorite theory , ought not to be the purpose of biological investigation . The relation that the ...
Página 893
... conclusion of the struggle between " Nature and Nurture . " Neo - Darwinians deal with centuries and ages . Forty years can accomplish nothing . If we again refer to the curves , we shall find other reasons for the belief that the ...
... conclusion of the struggle between " Nature and Nurture . " Neo - Darwinians deal with centuries and ages . Forty years can accomplish nothing . If we again refer to the curves , we shall find other reasons for the belief that the ...
Página 903
... conclusion that the relative proportions of the several joints therein were constant . This abnormal tarsus seemed ... conclusions till an account has been given of the observations made before and after his book was published . The ...
... conclusion that the relative proportions of the several joints therein were constant . This abnormal tarsus seemed ... conclusions till an account has been given of the observations made before and after his book was published . The ...
Página 2
... conclusion , if it could be established , would possess an importance for the general problems of cell - lineage even greater than its interest for the more special problems of annelid em- bryology . For if vestigial structures may ...
... conclusion , if it could be established , would possess an importance for the general problems of cell - lineage even greater than its interest for the more special problems of annelid em- bryology . For if vestigial structures may ...
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...