Footnotes to Evolution: A Series of Popular Addresses on the Evolution of LifeD. Appleton, 1907 - 392 pagini |
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Pagina ix
... Division of the centro- some . The spindle . Division of the chromosomes . Phases of cell division by karyokinesis . Direct division . Somatic and reproductive tissues . Differentiation of so- matic and reproductive tissues in Ascaris ...
... Division of the centro- some . The spindle . Division of the chromosomes . Phases of cell division by karyokinesis . Direct division . Somatic and reproductive tissues . Differentiation of so- matic and reproductive tissues in Ascaris ...
Pagina xi
... Division of the centro- some . The spindle . Division of the chromosomes . Phases of cell division by karyokinesis . Direct division . Somatic and reproductive tissues . Differentiation of so- matic and reproductive tissues in Ascaris ...
... Division of the centro- some . The spindle . Division of the chromosomes . Phases of cell division by karyokinesis . Direct division . Somatic and reproductive tissues . Differentiation of so- matic and reproductive tissues in Ascaris ...
Pagina 28
... division , and this process is supposably eternal , for natural death is known only . among many - celled or colonial organisms . It is a ne- cessity arising from complexity of organization . Com- plication and specialization of ...
... division , and this process is supposably eternal , for natural death is known only . among many - celled or colonial organisms . It is a ne- cessity arising from complexity of organization . Com- plication and specialization of ...
Pagina 38
... division or ' segmenta- tion ' many variations are recognised . In some the eggs are small and composed entirely of protoplasm , and here the segmentation is regular , but other eggs are . larger , and this increase in size is due to ...
... division or ' segmenta- tion ' many variations are recognised . In some the eggs are small and composed entirely of protoplasm , and here the segmentation is regular , but other eggs are . larger , and this increase in size is due to ...
Pagina 58
... division and nutrition , not only the laws of heredity , variation , natural selection , and mutual help , but all matters of human history , and the most complicated relations of civics , economics , and ethics . In this enormous ...
... division and nutrition , not only the laws of heredity , variation , natural selection , and mutual help , but all matters of human history , and the most complicated relations of civics , economics , and ethics . In this enormous ...
Alte ediții - Afișează-le pe toate
Footnotes to Evolution: A Series of Popular Addresses on the Evolution of Life David Starr Jordan Vizualizare completă - 1898 |
Footnotes to Evolution: A Series of Popular Addresses on the Evolution of Life David Starr Jordan Vizualizare completă - 1919 |
Footnotes to Evolution: A Series of Popular Addresses on the Evolution of Life David Starr Jordan Vizualizare completă - 1898 |
Termeni și expresii frecvente
acquired characters action adaptation adult altruism ammonites ancestors animals become birds blood body Brachiopoda causes centrosome chromatin chromosomes colony competition concessions conjugation creatures Crustacea cytoplasm Darwin degeneration degree descendants division egg cell elements embryo environment evidence extrinsic fact factors fauna fish fittest force forms function genera germ cell germinal growth hereditary heredity homology human increase individual influence inheritance knowledge larvæ larval less living mammals ment monism mother natural selection naturalists never nucleus ontogeny organic evolution paleontologist Pandorina parent peculiarities phenomena philosophy phylogeny plants possible produced progress protaspis protoconch protoplasm protozoa rabbit race recognised relations reproductive Richard Roe Sacculina says sense shore larks shown simple somatic species sperm stages structure struggle for existence survival tetrads theory things tion tissues trilobites truth ture variation vertebræ Weismann whorl words zygote
Pasaje populare
Pagina 29 - 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.
Pagina 29 - To my mind it accords better with what we know of the laws impressed on matter by the Creator, that the production and extinction of the past and present inhabitants of the world should have been due to secondary causes, like those determining the birth and death of the individual.
Pagina 1 - It is the doctrine of Malthus applied with manifold force to the whole animal and vegetable kingdoms; for in this case there can be no artificial increase of food, and no prudential restraint for marriage.
Pagina xvii - Two canine animals, in a time of dearth, may be truly said to struggle with each other which shall get food and live. But a plant on the edge of a desert is said to struggle for life against the drought, though more properly it should be said to be dependent on the moisture.
Pagina 226 - ... of each and all of us is to try to make the little corner he can influence somewhat less miserable and somewhat less ignorant than it was before he entered it. To do this effectually it is necessary to be fully possessed of only two beliefs: the first, that the order of nature is ascertainable by our faculties to an extent which is practically unlimited; the second, that our volition counts for something as a condition of the course of events.
Pagina 226 - We live in a world which is full of misery and ignorance, and the plain duty of each and all of us is to try to make the little corner he can influence somewhat less miserable and somewhat less ignorant than it was before he entered it.
Pagina 1 - 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.
Pagina 66 - It is good to make two blades of grass grow where only one grew before.
Pagina 293 - Animal Mechanism : a Treatise on Terrestrial and Aerial Locomotion. By Professor EJ Marey. With 117 Illustrations. Second Edition. Crown 8vo, 5*.
Pagina 165 - That lay in the house that Jack built. This is the cow with the crumpled horn, That tossed the dog, That worried the cat, That killed the rat, That ate the malt, That lay in the house that Jack built.