The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina
... connected form , a summary of the development of the vegetable kingdom in geological time . To the geologist and botanist the subject is one of importance with reference to their special pursuits , and one on which it has not been easy ...
... connected form , a summary of the development of the vegetable kingdom in geological time . To the geologist and botanist the subject is one of importance with reference to their special pursuits , and one on which it has not been easy ...
Pagina 1
... connection with botanical and geological pursuits . He has thus been engaged in the study of fossil plants for nearly half a century , and , while he has published much on the subject , has endeavoured carefully to keep within the ...
... connection with botanical and geological pursuits . He has thus been engaged in the study of fossil plants for nearly half a century , and , while he has published much on the subject , has endeavoured carefully to keep within the ...
Pagina 7
... connected with the remarkable fact that in earlier times low groups attain to an elevation unexampled in later times , when their places are occu- pied with plants of higher type . It is this historical development that we have to trace ...
... connected with the remarkable fact that in earlier times low groups attain to an elevation unexampled in later times , when their places are occu- pied with plants of higher type . It is this historical development that we have to trace ...
Pagina 24
... connected with each other to justify this last supposition . That the plant grew on land I cannot doubt , from its mode of occurrence ; that it was of dura- ble and resisting character is shown by its state of preser- vation ; and the ...
... connected with each other to justify this last supposition . That the plant grew on land I cannot doubt , from its mode of occurrence ; that it was of dura- ble and resisting character is shown by its state of preser- vation ; and the ...
Pagina 25
... connected with Nematophyton , because that tree shows no such surface - markings , though , as we have seen , it had bundles of tubes passing diagonally to the surface . These plants were more probably trees with an axis of barred ...
... connected with Nematophyton , because that tree shows no such surface - markings , though , as we have seen , it had bundles of tubes passing diagonally to the surface . These plants were more probably trees with an axis of barred ...
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Termeni și expresii frecvente
acrogens aërial roots Algæ allied America appear arctic areoles bark beds belong bituminous branches Brongniart bundles Calamites Canada Carboniferous Caulopteris cells cellular character climate coal coal-formation conifers Cordaites cycads cylinder Dadoxylon Dawson Demy 8vo described Devonian diameter Eocene Erian Europe exogenous Fcap ferns flora formation forms fossil plants fronds fructification fruit Gaspé genera genus Geological Society graphite Greenland hemisphere Illustrations Journal Laramie Laurentian leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores medullary rays Mesozoic Middle modern Nova Scotia occur outer Paleozoic period Permian petioles pines pinnate pinnules pith present probably Prof Psilophyton referred resemble Rhizocarps ribbed rocks sandstones scalariform scars Second Edition Sequoia shales Sigillaria Silurian similar Small crown 8vo species specimens Sphenophyllum Sporangites spore-cases spores sporocarps stems Sternbergia structure Tertiary thick Third Edition tion tissue tree-ferns trees trunks Upper Cretaceous vascular vegetable vols Williamson wood woody
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