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. ix
... influences , 167 ; Not all transmission is heredity , 168 ; Determination of sex , 170 ; Homologies and analo- gies , 172 ; Vestigial organs , 174 ; Significance of vestigial organs , 181 ; Heredity and its " laws , " 181 ; Galton's law ...
... influences , 167 ; Not all transmission is heredity , 168 ; Determination of sex , 170 ; Homologies and analo- gies , 172 ; Vestigial organs , 174 ; Significance of vestigial organs , 181 ; Heredity and its " laws , " 181 ; Galton's law ...
Стр. 1
... influences which control development in the individual and in the species which is the succession of individuals , together with the laws or observed sequences of events which development exhibits . From another point of view , this is ...
... influences which control development in the individual and in the species which is the succession of individuals , together with the laws or observed sequences of events which development exhibits . From another point of view , this is ...
Стр. 3
... influence of heredity , naturally arrange themselves so that a new organ- ism is formed similar to the parent organism . It was recognized that the form was predetermined by the ancestry , but no longer that the embryo was literally ...
... influence of heredity , naturally arrange themselves so that a new organ- ism is formed similar to the parent organism . It was recognized that the form was predetermined by the ancestry , but no longer that the embryo was literally ...
Стр. 4
... influences combine to modify the line of descent . With the separation of individuals by barriers of land and water and varying climate , differing lines of descent are brought into existence . The fact of descent with modification ...
... influences combine to modify the line of descent . With the separation of individuals by barriers of land and water and varying climate , differing lines of descent are brought into existence . The fact of descent with modification ...
Стр. 5
... influences as yet not even imagined , from the unknown and probably unknowable primitive element , protyl . The general movement is from the simple to the complex , from the homogeneous to the heterogeneous , from the inexperienced to ...
... influences as yet not even imagined , from the unknown and probably unknowable primitive element , protyl . The general movement is from the simple to the complex , from the homogeneous to the heterogeneous , from the inexperienced to ...
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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.