The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 3
... seen in one spot , say in one shaft sunk through the whole thickness of the earth's crust , this would be sufficient for our purpose , so far as the history of life is concerned . The evidence is similar to that obtained by Schlie- mann ...
... seen in one spot , say in one shaft sunk through the whole thickness of the earth's crust , this would be sufficient for our purpose , so far as the history of life is concerned . The evidence is similar to that obtained by Schlie- mann ...
Pagina 7
... seen that there is a certain rough correspondence between the order of rank of plants and the order of their appearance in time . The oldest plants that we certainly know are Algæ , and with these there are plants apparently with the ...
... seen that there is a certain rough correspondence between the order of rank of plants and the order of their appearance in time . The oldest plants that we certainly know are Algæ , and with these there are plants apparently with the ...
Pagina 25
... seen , it had bundles of tubes passing diagonally to the surface . These plants were more probably trees with an axis of barred vessels and thick , cellular bark , like the Lepidodendron of later periods , to be noticed in the sequel ...
... seen , it had bundles of tubes passing diagonally to the surface . These plants were more probably trees with an axis of barred vessels and thick , cellular bark , like the Lepidodendron of later periods , to be noticed in the sequel ...
Pagina 28
... seen in Protich- nites lineatus by the ordi- nary feet , and the central furrow by the tail . It was also shown that when the Limulus uses its swimming - feet it produces impressions of the character of those named FIG . 6. - Trail of ...
... seen in Protich- nites lineatus by the ordi- nary feet , and the central furrow by the tail . It was also shown that when the Limulus uses its swimming - feet it produces impressions of the character of those named FIG . 6. - Trail of ...
Pagina 38
... seen any specimens containing une- quivocal organic matter , and am inclined to think that most of them , if not the whole , are casts of worm - bur- rows , with trails radiating from them . Though I have confined myself in this notice ...
... seen any specimens containing une- quivocal organic matter , and am inclined to think that most of them , if not the whole , are casts of worm - bur- rows , with trails radiating from them . Though I have confined myself in this notice ...
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Termeni și expresii frecvente
abundant Acrogens aërial roots Algæ allied America animal appear arctic areoles bark beds belong bituminous branches Brongniart Calamites Canada carbon Carboniferous Caulopteris cellular character clay climate coal coal-formation conifers Cordaites cycads Dadoxylon Dawson deposits described Devonian diameter dicotyledonous Eocene Europe exogenous fact ferns flora formation forms fossil fossil plants fronds fructification fruit Gaspé genera genus Geological Society graphite Greenland gymnospermous Heer hemisphere Journal known land land-plants Laramie Laurentian leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores matter medullary rays Mesozoic Miocene modern Nematophyton northern Nova Scotia occur outer Palæozoic period Permian pines pinnules pith present preserved probably Prof Psilophyton referred remarkable resemble Rhizocarps rocks sandstones scalariform scars Sequoia shales Sigillaria Silurian similar species specimens Sphenophyllum Sporangites spore-cases spores sporocarps stems Sternbergia structure surface Tertiary thick tion tissue tree-ferns trees trunks types Upper Cretaceous vascular vegetable wood woody