PDF⋙ Geology for beginners; comprising a familiar explanation of geology and its associate sciences, mineralogy, physical geology, fossil conchology, fossil botany, and palaeontology by George Fleming Richardson
Geology for beginners; comprising a familiar explanation of geology and its associate sciences, mineralogy, physical geology, fossil conchology, fossil botany, and palaeontology by George Fleming Richardson
Geology for beginners; comprising a familiar explanation of geology and its associate sciences, mineralogy, physical geology, fossil conchology, fossil botany, and palaeontology by George Fleming Richardson PDF, ePub eBook D0wnl0ad
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1842 Excerpt: ...It is remarked, that while, in recent plants, the botanist has the opportunity of examining the organs both of fructification and vegetation taken together; and, from their structure is enabled to judge of the class, order, or genus to which the specimen belongs; in a fossil plant, the only parts capable of being examined are the internal structure of the stem, and its external surface, together with the position, division, outline and veinings of the leaves; while it has never yet occurred that any one specimen has afforded the whole, and, in general, it is only two or three of these characters which the botanist can employ. Thus if the subject of inquiry be a fragment of the fossil trunk of some unknown tree, if no trace can be ascertained of its exact anatomical structure, it may be possible, at least, to ascertain whether its wood was deposited in concentric zones, or in a confused manner; in the former case it would have been Dicotyledonous, or Exogenous; in the latter, Monocotyledonous, or Endogenous; if a transverse section should shew the remains of sinuous unconnected layers, resembling arcs, or parts of a circle, with their ends outwards, of a solid homogeneous character, and embedded among some softer substance, then it may be considered certain that such a stem belonged to some tree-fern. If the tissue is altogether cellular, and it can be satisfactorily ascertained that no vascular tissue is combined with it, the specimen, in all probability, has belonged to that division of the vegetable kingdom, which being propagated without the agency of sexes, is termed Cryptogamiae; care being observed to examine it rigorously, lest it prove a succulent portion of some Dicotyledonous tree, in which the vascular system is so scattered among cellular substa...From reader reviews:
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