The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 من الصفحات |
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الصفحة 25
... Haeckel has recently comprised under the name Protista , we see the pro- cesses of metamorphosis of tissue , nutrition , and repro- duction taking place , indeed , but in a manner so simple and undifferentiated , that we too must ...
... Haeckel has recently comprised under the name Protista , we see the pro- cesses of metamorphosis of tissue , nutrition , and repro- duction taking place , indeed , but in a manner so simple and undifferentiated , that we too must ...
الصفحة 26
... Haeckel's " Protamoeba . " A small albuminous mass increases by the absorption of nutriment , and by the appropriation of matter , until it reaches a certain circumference , and then propagates itself by spontaneous fission into two ...
... Haeckel's " Protamoeba . " A small albuminous mass increases by the absorption of nutriment , and by the appropriation of matter , until it reaches a certain circumference , and then propagates itself by spontaneous fission into two ...
الصفحة 27
... Haeckel . But independently of this complexity of the molecular structure , it is of extreme importance to the investiga- tion of animate nature to have become acquainted with bodies which present the simplest structure to the as ...
... Haeckel . But independently of this complexity of the molecular structure , it is of extreme importance to the investiga- tion of animate nature to have become acquainted with bodies which present the simplest structure to the as ...
الصفحة 40
... Haeckel , such as the Protamoba , those minute albuminous masses of sar- code , increase to a certain extent . Why these dimensions should vary only within definite narrow limits , and why , on attaining a certain extent , the molecules ...
... Haeckel , such as the Protamoba , those minute albuminous masses of sar- code , increase to a certain extent . Why these dimensions should vary only within definite narrow limits , and why , on attaining a certain extent , the molecules ...
الصفحة 43
... Haeckel's definition , are endowed with personality . If the tape - worm now comported itself like most other animals , somites would be directly developed from its eggs . But to this there is a very circuitous proceeding . If the egg ...
... Haeckel's definition , are endowed with personality . If the tape - worm now comported itself like most other animals , somites would be directly developed from its eggs . But to this there is a very circuitous proceeding . If the egg ...
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عبارات ومصطلحات مألوفة
according adaptation already Ammonites Amphibians animal world apes appearance Ascidian become birds brain causes Cetacea character characteristics comparative anatomy complete connection continent Darwin dentition derivation diverge doctrine of Descent Echinoderms embryonic Eocene exhibit external facts families fauna fish formation fossil Ganoids Gastrula genera genus geological Goethe grade gradually groups Haeckel heredity higher horse human hypothesis idea individual infer intermediate forms islands lancelet language larva larvæ likewise linguistic Linnæus lower mammals Marsupials Medusa ment merely metamorphosis modifications morphological mutability natural selection observation Oolite organisms origin peculiar pedigree perfect period phase phenomena placenta plants polypes possess present primordial progenitors races relations remains reproduction reptiles resemblance Rütimeyer says scarcely scientific separate sexual Silurian skull species sponges strata structure systematic terrestrial animals Tertiary theory of selection tion transformation transition true Ungulata Ungulates varieties vegetal vertebral column Vertebrata vertebrate animals whole
مقاطع مشهورة
الصفحة 162 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.18 Darwin always knew that his views would be controversial. A few days before The Origin of Species appeared, Darwin wrote, in a letter to Wallace, 'God knows what...
الصفحة 160 - I had not formerly sufficiently considered the existence of many structures which appear to be, as far as we can judge, neither beneficial nor injurious ; and this I believe to be one of the greatest oversights as yet detected in my work.
الصفحة 160 - Na'geli on plants, and the remarks by various authors with respect to animals, more especially those recently made by Professor Broca, that in the earlier editions of my Origin of Species I perhaps attributed too much to the action of natural selection or the survival of the fittest.