Proceedings of the Washington Academy of Sciences (Volume 1 )
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Proceedings of the Washington Academy of Sciences (Volume 1 )

Proceedings of the Washington Academy of Sciences (Volume 1 )


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About the Book

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.1900 Excerpt: ... which, for some reason, there is no outer layer, to the left of which it extends entirely to the margin, and on the right of which it fills a deep depression in the surface. PI. XIX includes the greater part of the portion on the left where this layer is present, and PI. XX covers the area on the right. All the characters, generic and specific, are admirably brought out in these two enlarged areas, especially the nature of the ramentum outside of the armor, and its wavy, crinkled character as determined by the irregularities of the surface and the unknown agencies that compressed it from without and packed in down against the trunk. In several places portions of leaf bases and perhaps of reproductive organs, detached from the armor and caught, as it were, in the meshes of chaff, can be seen lodged in the outer coat. These show their normal vascular structure under the compound microscope. Owing to inequalities of pressure and unexplained conditions the long strands of matted chaff are differentiated into bands of different color and density that lie parallel to one another and zigzag across the exposed cross-sections of the investing layer. Near the left margin of PI. XX there is a region where one of the petioles is clearly seen to cross the boundary line between the armor and the ramentaceous covering, and the chaff that developed from its left side can also be traced across this boundary and out into the outer layer. This is particularly instructive from the point of view of the origin of the latter. Upon the whole these several illustrations afford a tolerably clear idea of the character of this remarkable group of extinct plants. CYCADELLA COMPRESSA n. sp. Trunks small (10-20cm high, with major diameter 12-15cm), originally conical, all much compressed...


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Product Details
  • ISBN-13: 9781235810312
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 120
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1235810313
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 227 gr


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