Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 40
... stem , and only the protopodite retains its two normal component parts . The mandibles ( fig . 14 ) , the appendages of the fourth segment , are modified entirely for mastica- tion . They consist of a strong transverse piece ( pr ...
... stem , and only the protopodite retains its two normal component parts . The mandibles ( fig . 14 ) , the appendages of the fourth segment , are modified entirely for mastica- tion . They consist of a strong transverse piece ( pr ...
Pagina 68
... stem , and have FIG . 37. - Growing point of Vicia varia , showing the origin of leaves . 1 , 2 , 3 , 4 , leaves respectively older ; leaf 1 is still in the primordial condition ; leaf 2 is divided into epipodium and hypopodium ( h ) ...
... stem , and have FIG . 37. - Growing point of Vicia varia , showing the origin of leaves . 1 , 2 , 3 , 4 , leaves respectively older ; leaf 1 is still in the primordial condition ; leaf 2 is divided into epipodium and hypopodium ( h ) ...
Pagina 69
... stem ( the hypopod ) , a distal part ( the epipod ) , and an inter- mediate part ( the mesopod ) . From this point the various parts of the leaf begin to develop individually . Little foliacious lamina ( the stipules ) frequently arise ...
... stem ( the hypopod ) , a distal part ( the epipod ) , and an inter- mediate part ( the mesopod ) . From this point the various parts of the leaf begin to develop individually . Little foliacious lamina ( the stipules ) frequently arise ...
Pagina 73
... stem the leaf blades are more and more reduced , until eventually they are no longer differentiated into hypopod and epipod , but arise directly from the growth of the primordial leaf ( fig . 39 , D to F ) . aquatic plant , the foliage ...
... stem the leaf blades are more and more reduced , until eventually they are no longer differentiated into hypopod and epipod , but arise directly from the growth of the primordial leaf ( fig . 39 , D to F ) . aquatic plant , the foliage ...
Pagina 76
... stem ( fig . 41 , leaves 7 and 8 ) are some leaves consisting of two stipules and a non- branching tendril . The latter represents the meso- pod and the epipod from which the lateral leaflets have disappeared . Below the foliage leaves ...
... stem ( fig . 41 , leaves 7 and 8 ) are some leaves consisting of two stipules and a non- branching tendril . The latter represents the meso- pod and the epipod from which the lateral leaflets have disappeared . Below the foliage leaves ...
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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