Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 13
... appears so obvious that for a long time it was regarded as a distinct species - some kind of worm . At first sight , then , the hectocotyle seems to be an individual . This , however , is not the case , as it reproduces , not a ...
... appears so obvious that for a long time it was regarded as a distinct species - some kind of worm . At first sight , then , the hectocotyle seems to be an individual . This , however , is not the case , as it reproduces , not a ...
Pagina 22
... appear as the two sides of one whole , or as two aspects of the same evolution , and it will be seen that all progress must necessarily be attended by degenera- tion . CHAPTER I IN THE EVOLUTION OF ORGANS ALL MODIFICATION IS NECESSARILY ...
... appear as the two sides of one whole , or as two aspects of the same evolution , and it will be seen that all progress must necessarily be attended by degenera- tion . CHAPTER I IN THE EVOLUTION OF ORGANS ALL MODIFICATION IS NECESSARILY ...
Pagina 43
... appear to have undergone the following transformations : The bi- pinnated fin ( such as that of Ceratodus ) ( fig . 18 ) is always the starting - point . Then the lateral rods of one half almost completely disappear ( as in ...
... appear to have undergone the following transformations : The bi- pinnated fin ( such as that of Ceratodus ) ( fig . 18 ) is always the starting - point . Then the lateral rods of one half almost completely disappear ( as in ...
Pagina 67
... appear- ance ( rs . ) . The phalanges are very well developed ( phal . ) , but , on the other hand , the distal phalanges ( ph . ) have degenerated and are very short . Heterocephalus ( fig . 36 ) is a burrowing rodent , only , instead ...
... appear- ance ( rs . ) . The phalanges are very well developed ( phal . ) , but , on the other hand , the distal phalanges ( ph . ) have degenerated and are very short . Heterocephalus ( fig . 36 ) is a burrowing rodent , only , instead ...
Pagina 72
... appears altogether ( fig . 38 , H and 1 ) . The apical leaves , like the basilar leaves , are eventually reduced simply to the hypopod . 2. Serratula cen- tauroides . The foli- age leaves of this species are close to the ground , their ...
... appears altogether ( fig . 38 , H and 1 ) . The apical leaves , like the basilar leaves , are eventually reduced simply to the hypopod . 2. Serratula cen- tauroides . The foli- age leaves of this species are close to the ground , their ...
Alte ediții - Afișează-le pe toate
Evolution by Atrophy in Biology and Sociology Jean Demoor,Jean Massart,Emile Vandervelde Vizualizare completă - 1899 |
Evolution by Atrophy in Biology and Sociology Jean Demoor,Jean Massart,Emile Vandervelde Vizualizare completă - 1899 |
Evolution by Atrophy in Biology and Sociology Jean Demoor,Jean Massart,Emile Vandervelde Vizualizare completă - 1899 |
Termeni și expresii frecvente
adult ancestral stages animals antheridia apical leaves appear appendages aquatic Archaeopteryx assimilative atrophy basilar leaves became become belonging bipinnated blade branches calcaneum canal cells characters chlorophyll collective property colony complete condition consists corporations Crustacea custom degeneration degenerative evolution digits disappeared embryo endopodite epipod exhibited existence exopodite female feudal floating leaves flowers foliage leaves formation formed function gland Huxley hypopod Illustrations individual instance institutions intercentrum land larval Lathyrus Aphaca leaf leaflets limbs male mammals marriage masuirs maxillipede mesonephros metatarsals modern modification muscles normal original pairs petiole phalanges pineal eye plants podite primitive Professor progressive evolution pronephros prothallus protopodite pr reduced regarded remain represent retracing Rosa rugosa rudimentary organs segment sepal slow-worm social societies sociology species stamens stem stipules stomata structure survival tarsius tendrils terminal thalamencephalon third tion traces transformation undergone useless vertebral column vertebrates vestiges wings
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