The Geological History of PlantsD. Appleton & Company, 1892 - 294 pagini |
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Pagina 8
... already land and water , and that the waters and possibly the land were already tenanted by living beings . The great beds of limestone which exist in this part of the system furnish one indication of this . In the later geological ...
... already land and water , and that the waters and possibly the land were already tenanted by living beings . The great beds of limestone which exist in this part of the system furnish one indication of this . In the later geological ...
Pagina 18
... already been introduced upon the earth . It has been well said that no amount of study of inorganic nature would ever have enabled any one to anticipate the possibility of the construction of an apparatus having the chemical powers of ...
... already been introduced upon the earth . It has been well said that no amount of study of inorganic nature would ever have enabled any one to anticipate the possibility of the construction of an apparatus having the chemical powers of ...
Pagina 24
... already referred . They are trees of large size , with a coaly bark and large spreading roots , having the surface of the stem smooth or irregularly ribbed , but with a nodose or jointed appearance . Internally , they show a tissue of ...
... already referred . They are trees of large size , with a coaly bark and large spreading roots , having the surface of the stem smooth or irregularly ribbed , but with a nodose or jointed appearance . Internally , they show a tissue of ...
Pagina 25
... already been referred to , and Claypole has described a tree from the Clinton group of the United States , with large ovate leaf - bases , to which he has given the name Glyptodendron . If the markings on these plants are really leaf ...
... already been referred to , and Claypole has described a tree from the Clinton group of the United States , with large ovate leaf - bases , to which he has given the name Glyptodendron . If the markings on these plants are really leaf ...
Pagina 32
... already suggested this origin for some scratches of somewhat different form found in the Primordial of Great Britain . He supposed them to have been the work of species of Hymenocaris . These marks may , however , indicate the existence ...
... already suggested this origin for some scratches of somewhat different form found in the Primordial of Great Britain . He supposed them to have been the work of species of Hymenocaris . These marks may , however , indicate the existence ...
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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