Lectures on the Darwinian Theory Delivered by the Late Arthur Milnes MarshallMacmillan, 1900 - 236 من الصفحات |
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الصفحة xii
... Ascidians , by Barnacles , and by many groups of Parasitic animals . The Recapitulation Theory . The doctrine of Evolution tells us that animals , like men , have pedigrees . The study of Embryology reveals to us this ancestry , because ...
... Ascidians , by Barnacles , and by many groups of Parasitic animals . The Recapitulation Theory . The doctrine of Evolution tells us that animals , like men , have pedigrees . The study of Embryology reveals to us this ancestry , because ...
الصفحة xvi
... Ascidians . Supposed ancestral relations to other Vertebrates . The development of Ascidians . Evidence of degeneration . Evidence in favour of a pelagic marine ancestry for all Vertebrates . Supposed relations with Invertebrates . 36 ...
... Ascidians . Supposed ancestral relations to other Vertebrates . The development of Ascidians . Evidence of degeneration . Evidence in favour of a pelagic marine ancestry for all Vertebrates . Supposed relations with Invertebrates . 36 ...
الصفحة xix
... ASCIDIAN AND FROG TADPOLES ( after LANKESTER ) after FRITZ MULLER ) 10. BARNACLE , Development of . ( From a drawing by the Author , after SPENCE BATE ) II . SACCULINA , Development and Degeneration of . ( From a drawing by the Author ...
... ASCIDIAN AND FROG TADPOLES ( after LANKESTER ) after FRITZ MULLER ) 10. BARNACLE , Development of . ( From a drawing by the Author , after SPENCE BATE ) II . SACCULINA , Development and Degeneration of . ( From a drawing by the Author ...
الصفحة 79
... Ascidians are a well- known example . So long as their adult condition alone was known , zoologists were entirely in the dark as to their real affinities , and by most writers they were grouped with the Brachiopoda and Polyzoa , as THE ...
... Ascidians are a well- known example . So long as their adult condition alone was known , zoologists were entirely in the dark as to their real affinities , and by most writers they were grouped with the Brachiopoda and Polyzoa , as THE ...
الصفحة 80
... Ascidian ( A , Frog ; B , Ascidian ) . b , brain ; d , spinal cord ; e , eye ; i , intestine ; m , mouth ; n , notochord ; 1 , pharynx with gill - slits ; s , spiracle to tadpoles - not merely in form and appearance , but in all ...
... Ascidian ( A , Frog ; B , Ascidian ) . b , brain ; d , spinal cord ; e , eye ; i , intestine ; m , mouth ; n , notochord ; 1 , pharynx with gill - slits ; s , spiracle to tadpoles - not merely in form and appearance , but in all ...
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عبارات ومصطلحات مألوفة
actual adult condition afforded Amphioxus ancestors ancestral history animals and plants antennules antlers appearance artificial selection Ascidians birds body butterflies camels caterpillar causes cells changes characters conspicuous Crab Cuvier Darwin deposits descended distinct doctrine of Evolution domestic pigeons earth eggs embryo embryology Eocene evidence example explanation extinct fact feathers fertilised Fissurella flat fish flowers food-yolk forms fossils frog geological gills gradually habits Haliotis hatching higher animals Hilaire horse insects instance intermediate known Lamarck large numbers larva larvæ limbs Linnæus living mammals Metazoa Miocene mode modification moth mouth Natural Selection Nauplius organs origin pairs palæontological parasitic pigeons Pliocene pollen masses pollinia present preserved produce protective colouring Protozoa pupa Recapitulation Theory regard reptiles resemblance rudimentary Sacculina seen shell side skin species stage structure struggle for existence survive swimming Tadpole tail tion variations Vertebrates Wallace warning colours wings young
مقاطع مشهورة
الصفحة 214 - In the distant future I see open fields for far more important researches. Psychology will be based on a new foundation, that of the necessary acquirement of each mental power and capacity by gradation. Light will be thrown on the origin of man and his history.
الصفحة 210 - 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...
الصفحة 224 - I had, also, during many years followed a golden rule, namely, that whenever a published fact, a new observation or thought came across me, which was opposed to my general results, to make a memorandum of it without fail and at once; for I had found by 69 experience that such facts and thoughts were far more apt to escape from the memory than favourable ones.
الصفحة 163 - The death of a man at a critical juncture, his disgust, his retreat, his disgrace, have brought innumerable calamities on a whole nation. A common soldier, a child, a girl at the door of an inn, have changed the face of fortune, and almost of Nature.
الصفحة 223 - From my early youth I have had the strongest desire to understand or explain whatever I observed, — that is, to group all facts under some general laws.
الصفحة 208 - In July opened first note-book on Transmutation of Species. Had been greatly struck from about the month of previous March on character of South American fossils, and species on Galapagos Archipelago. These facts (especially latter), origin of all my views...
الصفحة 219 - I was idling and resting near Hartfield, where two species of Drosera abound; and I noticed that numerous insects had been entrapped by the leaves. I carried home some plants, and on giving them insects saw the movements of the tentacles, and this made me think it probable that the insects were caught for some special purpose. Fortunately a crucial test occurred to me, that of placing a large number of leaves in various nitrogenous and non-nitrogenous fluids of equal density; and as soon as I found...
الصفحة 70 - I look at the geological record as a history of the world imperfectly kept, and written in a changing dialect ; of this history we possess the last volume alone, relating only to two or three countries. Ot this volume, only here and there a short chapter has been preserved ; and of each page, only here and there a few lines.
الصفحة 38 - There is no exception to the rule that every organic being naturally increases at so high a rate that, if not destroyed, the earth would soon be covered by the progeny of a single pair.
الصفحة 202 - Nothing could have been worse for the development of my mind than Dr. Butler's school, as it was strictly classical, nothing else being taught, except a little ancient geography and history. The school as a means of education to me was simply a blank.