Nomogenesis: Or, Evolution Determined by LawM.I.T. Press, 1969 - Всего страниц: 477 |
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Стр. 86
... occur undeveloped female flowers , which possibly serve as nectaries , thereby attracting insects . The species of Ephedra are generally dioecious , but several are some- times monoecious . Wettstein ( 1907 ) has described speci- mens ...
... occur undeveloped female flowers , which possibly serve as nectaries , thereby attracting insects . The species of Ephedra are generally dioecious , but several are some- times monoecious . Wettstein ( 1907 ) has described speci- mens ...
Стр. 240
... occur in various kinds of apricots . Some kinds of melons produce fruits which very much resemble those of other genera of the same family of Cucurbitaceae , such as cucumbers , etc. Feather - footed races occur in poultry , 1 See also ...
... occur in various kinds of apricots . Some kinds of melons produce fruits which very much resemble those of other genera of the same family of Cucurbitaceae , such as cucumbers , etc. Feather - footed races occur in poultry , 1 See also ...
Стр. 258
... occur as cases of atavism among heaths ( Ericaceae ) , belonging to the lowest representatives of the Sympetalae , such as Ledum , Pirola and others , while choripetalous flowers are sometimes observed to occur , as anomalies , among ...
... occur as cases of atavism among heaths ( Ericaceae ) , belonging to the lowest representatives of the Sympetalae , such as Ledum , Pirola and others , while choripetalous flowers are sometimes observed to occur , as anomalies , among ...
Содержание
THE STRUGGLE FOR EXISTENCE AND NATURAL | 1 |
Various types of the struggle for existence | 45 |
Is survival a privilege of the bearers of useful | 62 |
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Abel accidental according adapted adult allied America ammonites amphibians ancestors angiosperms Animals and Plants appear belonging Bennettitales birds bones butterflies Carinatae chance chap characters colour common complex Craniata Cretaceous Crossopterygii Darwin definite direction derived determined direction dicotyledons dinosaurs Dipnoi dorsal due to convergence embryo evolution exhibit external extinct female fins fishes formation forms Fürbringer genera genus groups gymnosperms hind-limbs independently insects instance Kuznetzov lamarckiana latter living Lotsy lower male mammals manifested means mimicry Monochlamydeae monocotyledons mutations natural selection number of individuals observed occur ontogeny opinion organisation Origin of Species Ornithischia orthogenesis Osborn parallel pectoral peculiar phenomena phylogeny Piperales placenta Placentalia Polycarpicae polyphyletic polyphyletic origin possess primitive produced Pseudosuchia pterosaurs Ratitae referred regarded remarkable reptiles resemblance Russian Saurischia says seeds shell similar skull structure struggle for existence sub-species teeth Teleostomi tendency tetrapods theory tion transformation varieties Vavilov vertebrates Vries wings