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. 6
... birds . Tendencies in organic development are not mystic purposes , but actual functions of actual organs . Tendencies in inorganic nature are due to the interrelations of mass and force , whatever may be the final meanings attached to ...
... birds . Tendencies in organic development are not mystic purposes , but actual functions of actual organs . Tendencies in inorganic nature are due to the interrelations of mass and force , whatever may be the final meanings attached to ...
Стр. 12
... Birds and trees , beetles and butterflies , fishes and flowers , ferns and blades of grass , all these are objects . of constant recognition . The green cloak which covers the brown earth is the shield under which myriads of organisms ...
... Birds and trees , beetles and butterflies , fishes and flowers , ferns and blades of grass , all these are objects . of constant recognition . The green cloak which covers the brown earth is the shield under which myriads of organisms ...
Стр. 13
... bird or squirrel is a species . Those individuals which agree very closely in structure and function belong to the same species . There is no absolute test , other than the common judgment of men competent to decide . Naturalists ...
... bird or squirrel is a species . Those individuals which agree very closely in structure and function belong to the same species . There is no absolute test , other than the common judgment of men competent to decide . Naturalists ...
Стр. 16
... birds , the body tissues of mosquitoes , all places where animal life is found , are being examined with an eagerness not less than that of the early explorers , while the investigators of to - day are armed with every appliance that ...
... birds , the body tissues of mosquitoes , all places where animal life is found , are being examined with an eagerness not less than that of the early explorers , while the investigators of to - day are armed with every appliance that ...
Стр. 34
... birds , and. FIG . 21. - A group of stalked one - celled animals , Carchesium , sp . ( Adapted from Davenport , from a photograph of the liv- ing animals . ) grouped into two regions and the appendages limited to the anterior one of ...
... birds , and. FIG . 21. - A group of stalked one - celled animals , Carchesium , sp . ( Adapted from Davenport , from a photograph of the liv- ing animals . ) grouped into two regions and the appendages limited to the anterior one of ...
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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.