Evolution and Animal Life: An Elementary Discussion of Facts, Processes, Laws and Theories Relating to the Life and Evolution of AnimalsD. Appleton, 1907 - Всего страниц: 489 |
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Стр. 4
... appear to us seem to be determined by proximate causes alone . Among these proximate causes are differences in structure and in degrees of adaptability among individuals , the operation of the rule of the survival of the best adapted ...
... appear to us seem to be determined by proximate causes alone . Among these proximate causes are differences in structure and in degrees of adaptability among individuals , the operation of the rule of the survival of the best adapted ...
Стр. 7
... appear . Not only do they affect the individual animal or plant , but they affect all groups of living things , classes or races or species . No character is permanent , no trait of life without change ; and as the living organism and ...
... appear . Not only do they affect the individual animal or plant , but they affect all groups of living things , classes or races or species . No character is permanent , no trait of life without change ; and as the living organism and ...
Стр. 19
... appear . The squirrels or the ducks will differ in shade of color , in dis- tinctness of marking , in length of limb , in breadth of organ , in every way in which there is play for in- dividualism . The same individu- Nor are these ...
... appear . The squirrels or the ducks will differ in shade of color , in dis- tinctness of marking , in length of limb , in breadth of organ , in every way in which there is play for in- dividualism . The same individu- Nor are these ...
Стр. 22
... appear . In all the cells is the mysterious nuclear sub- stance which seems to direct the operations of heredity . The same laws or methods of heredity , variability , and response to outside stimulus hold in all the organic world . We ...
... appear . In all the cells is the mysterious nuclear sub- stance which seems to direct the operations of heredity . The same laws or methods of heredity , variability , and response to outside stimulus hold in all the organic world . We ...
Стр. 26
... too must be organized in a particular way in order that life may persist in the organism . It must appear in two conditions , and proto- plasmic stuff representing these two conditions must be disposed in 26 EVOLUTION AND ANIMAL LIFE.
... too must be organized in a particular way in order that life may persist in the organism . It must appear in two conditions , and proto- plasmic stuff representing these two conditions must be disposed in 26 EVOLUTION AND ANIMAL LIFE.
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actual adaptation adult animals and plants ants appear artificial selection become bees beetles biologists birds body breeding Burbank butterfly called causes centrosome changes characters chromatin chromosomes color and pattern common crab Darwin degeneration degree division egg cell embryo environment evolution existence fact factors fauna feeding female fertilized fishes forms fossils gastrula genus germ cells habit hatched heredity honeybee host hybrid individuals influence inheritance insects instinct islands isolation kinds of animals larva larvæ legs live lower male mammals ment modified mutations natural selection naturalists nest nucleus offspring organs Origin of Species original parasites parent phenomena plasm produced protoplasm Protozoa rabbit race relation reproduction resemblance rocks Sacculina sea anemone sexual sexual selection sheep simple species species-forming sperm spines stage structure tail tetrads theory tion traits tree variation various vertebrates Vries Weismann wings workers worm young
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Стр. 466 - 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.
Стр. 424 - ... 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. 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.
Стр. 23 - ... x's and y's with which he works his problems, for real entities — and with this further disadvantage, as compared with the mathematician, that the blunders of the latter are of no practical consequence, while the errors of systematic materialism may paralyse the energies and destroy the beauty of a life.
Стр. 466 - 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.
Стр. 424 - 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.
Стр. 61 - Near villages and small towns I have found the nests of humble-bees more numerous than elsewhere, which I attribute to the number of cats that destroy the mice.
Стр. 135 - Our ignorance of the laws of variation is profound. Not in one case out of a hundred can we pretend to assign any reason why this or that part has varied.
Стр. 455 - Thus, whatever system of organs be studied, the comparison of their modifications in the ape series leads to one and the same result — that the structural differences which separate man from the gorilla and the chimpanzee are not so great as those which separate the gorilla from the lower apes.
Стр. 118 - Given any species in any region, the nearest related species is not likely to be found in the same region, nor in a remote region, but in a neighboring district, separated from the first by a barrier of some sort, or at least by a belt of country the breadth of which gives the effect of a barrier.