The Shipley Collection of Scientific Papers, Том 231897 |
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Стр. 883
... tion is one that at the present time still divides two schools of speculative biology , and is a question that can be solved only by those inductive methods which it is the function of a Biological Laboratory to suggest , adopt , and ...
... tion is one that at the present time still divides two schools of speculative biology , and is a question that can be solved only by those inductive methods which it is the function of a Biological Laboratory to suggest , adopt , and ...
Стр. 884
... tion to the new environment , degeneration and perhaps final elimination ensues . It would also be of incidental interest to learn from observed facts whether the suspension of the action of natural selection . is felt immediately by an ...
... tion to the new environment , degeneration and perhaps final elimination ensues . It would also be of incidental interest to learn from observed facts whether the suspension of the action of natural selection . is felt immediately by an ...
Стр. 885
... tion has been suspended . For a proper discussion of propositions 2 , 3 , and 4 , it was my first purpose to collect a large number of the American birds and compare them directly with an equal number collected . in England ; but the ...
... tion has been suspended . For a proper discussion of propositions 2 , 3 , and 4 , it was my first purpose to collect a large number of the American birds and compare them directly with an equal number collected . in England ; but the ...
Стр. 886
... tion of variation around the mean . Now if a species or struc- ture is stable and shows only a slight tendency to vary , the base of the curve obviously will be short . If , on the con- 18mm 18.5mm 19mm 19.5mm 20mm 169 20.5mm 21mm 21.5 ...
... tion of variation around the mean . Now if a species or struc- ture is stable and shows only a slight tendency to vary , the base of the curve obviously will be short . If , on the con- 18mm 18.5mm 19mm 19.5mm 20mm 169 20.5mm 21mm 21.5 ...
Стр. 888
... tion of American eggs , the unbroken line , of British . On this diagram it will be noted that the American eggs again show a greater amplitude of variation , the base of the dotted curve being nearly one - fifth broader than that of ...
... tion of American eggs , the unbroken line , of British . On this diagram it will be noted that the American eggs again show a greater amplitude of variation , the base of the dotted curve being nearly one - fifth broader than that 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...