Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina xiii
... male Machaerites § 2. Unfunctional organs which persist as rudiments 1. Absence of variation . Insignificance 、 f the rudi- mentary organ ( stipules of Tropaeolum majus , acce - sory rudiments of enamel organs in the development of ...
... male Machaerites § 2. Unfunctional organs which persist as rudiments 1. Absence of variation . Insignificance 、 f the rudi- mentary organ ( stipules of Tropaeolum majus , acce - sory rudiments of enamel organs in the development of ...
Pagina 10
... ( male and female ) , proceeding usually from two separate individuals . From the moment that this union is effected , the continuity remains unbroken.2 When such an individual reproduces 1 We regard the cell as the unit of life ...
... ( male and female ) , proceeding usually from two separate individuals . From the moment that this union is effected , the continuity remains unbroken.2 When such an individual reproduces 1 We regard the cell as the unit of life ...
Pagina 12
... male cephalopods , at the period of reproduction , separate from their bodies a specialized tentacle ( hectocotyle ) in which is stored the seminal fluid . This organ , set at liberty , swims in the III . Communities and societies ...
... male cephalopods , at the period of reproduction , separate from their bodies a specialized tentacle ( hectocotyle ) in which is stored the seminal fluid . This organ , set at liberty , swims in the III . Communities and societies ...
Pagina 33
... male , the organs of this segment , as also those of the segment in front of it , have become organs used in fertilization . We must consider what new structures have appeared here , and to what extent these new modifications have been ...
... male , the organs of this segment , as also those of the segment in front of it , have become organs used in fertilization . We must consider what new structures have appeared here , and to what extent these new modifications have been ...
Pagina 34
... male , the appendages of this segment ( fig . 7 ) possess an unjointed rod ( t ) cor- responding to the endopodite of the FIG . 7. — Astacus fluvia- second segment , and this rod stretches out to a considerable distance . The exopodite ...
... male , the appendages of this segment ( fig . 7 ) possess an unjointed rod ( t ) cor- responding to the endopodite of the FIG . 7. — Astacus fluvia- second segment , and this rod stretches out to a considerable distance . The exopodite ...
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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