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Contributions from the Botanical Laboratory of the University of Pennsylvania (Volume 2)

Contributions from the Botanical Laboratory of the University of Pennsylvania (Volume 2)


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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. 1904. Excerpt: ... Darwin the efforts of biological investigation have been largely directed towards the solution of this problem. But many of the investigators worked wholly upon gross anatomy, as it might be termed, in distinction to the study of the cell. They failed to realize that, as the alchemist was being driven from masses to atoms as a basis for his investigations, they too, if they were to solve the questions which interested them most, must get down to the minutest structural elements of plants and animals. The introduction of the cell theory by Schleiden in 1838 completely revolutionized the older ideas of transmission, and concentrated attention upon the cell and its contents as the true vehicles of heredity. Even here again war waged between conflicting theories. Darwin's "gemmules," Weismann's "germ plasm," His's "germinal location," Naegeli's "idioplasm" have all had their turn in the arena of conflict, and from this discussion has come the conviction that in the chromatin and linin of the nucleus is to be found the real hereditary material as is well indicated by Wilson (86), who says: "In accepting this view we admit that the cytoplasm of the egg is, in a measure, the substratum of inheritance, but it is only by virtue of its relation to the nucleus, which is, so to speak, the ultimate court of appeal. The nucleus cannot operate without a cytoplasmic field in which its peculiar powers may come into play; but this field is created and moulded by itself. Both are necessary to development; the nucleus alone suffices for inheritance of specific possibilities of development." But the cells in which nuclei have been undoubtedly demonstrated in the past are in the plants above the Cyanophyceae. In the group of Protophyta, lying at the base of the vegetable kingd...


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Product Details
  • ISBN-13: 9781235701788
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 132
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 1235701786
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 249 gr


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