The Method of Evolution: A Review of the Present Attitude of Science Toward the Question of the Laws and Forces which Have Brought about the Origin of Species |
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Page 216
... Weismannian school does not deny that there may be such a thing as increase in mental power . Such has doubtless occurred in the passage from animal intelligence to that of man and it may still be going on . Civilized races may have a ...
... Weismannian school does not deny that there may be such a thing as increase in mental power . Such has doubtless occurred in the passage from animal intelligence to that of man and it may still be going on . Civilized races may have a ...
Page 222
... Weismann's theory of heredity . It is only when the doctrine of natural selection is claimed to be a complete ex ... Weismannian school . Relation of Weismannism to the Problems of Varia- tion and Evolution We notice first that a ...
... Weismann's theory of heredity . It is only when the doctrine of natural selection is claimed to be a complete ex ... Weismannian school . Relation of Weismannism to the Problems of Varia- tion and Evolution We notice first that a ...
Page 227
... Weismannian school , but it has lately been quoted with approbation by Weismann himself as expressing the present condi- tion of the discussion . Since , then , it represents the position of the two opposing schools , we may regard it ...
... Weismannian school , but it has lately been quoted with approbation by Weismann himself as expressing the present condi- tion of the discussion . Since , then , it represents the position of the two opposing schools , we may regard it ...
Page 230
... Weismann assumed that this germ plasm is perpetually continuous . By this is meant that the germ plasm is always handed down from parent to child without ... Weismannian theory of evolution must be modified . We 230 THE METHOD OF EVOLUTION.
... Weismann assumed that this germ plasm is perpetually continuous . By this is meant that the germ plasm is always handed down from parent to child without ... Weismannian theory of evolution must be modified . We 230 THE METHOD OF EVOLUTION.
Page 231
... Weismannian theory of evolution must be modified . We shall see that both positions have been virtually given up . Stability of Germ Plasm - Theoretical Conclusions It is this phase of the theory that has made neces- sary the claim that ...
... Weismannian theory of evolution must be modified . We shall see that both positions have been virtually given up . Stability of Germ Plasm - Theoretical Conclusions It is this phase of the theory that has made neces- sary the claim that ...
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Common terms and phrases
acquired characters acquired variations acters action adapted adult animals and plants arise average become body breeding cells centrosome certainly changes char chemical chemical compound chromatin chromosomes conception conclusion congenital characters congenital variations course cross-breeding Darwin definite lines descent determinate variation difficulty direct discontinuous variations discussion disuse divergence divergent evolution duced effect environment evidence explain eyes fact fittest forces germ plasm germ substance germinal groups habit hap-hazard hereditary influence inheritance of acquired instincts isolation Lamarckian factors Lamarckism large number larvæ matter mean ment method of evolution modified natural selection naturalists Neo-Darwinism occur offspring organic selection origin of species parents preserved principle problem protoplasm question race recognized regard result sexual reproduction sexual union simply specific characters spermatozoön starfish structure struggle for existence study of variation supposed survival theory of heredity tion to-day transmitted vidual Weismann Weismann's theory Weismannian
Popular passages
Page i - Review of the Present Attitude of Science toward the Question of the Laws and Forces which have brought about the Origin of Species, 1900 : pp.
Page 72 - ... survival of the fittest, and of these that are thus killed doubtless some are superior to those that survive. This principle of indiscriminate elimination does not in the slightest deny the force of the principle of survival of the fittest, but only indicates that its action is not absolutely rigid. The fittest do not always survive, for many of them are destroyed.