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Home > Art, Film & Photography > Experimental Evolution; Lectures Delivered in the Summer School of Art and Science, University Hall, Edinburgh (August, 1891)
Experimental Evolution; Lectures Delivered in the Summer School of Art and Science, University Hall, Edinburgh (August, 1891)

Experimental Evolution; Lectures Delivered in the Summer School of Art and Science, University Hall, Edinburgh (August, 1891)


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: LECTURE III Summary: The Facts of Natural or Spontaneous Variation (concluded)? Physiological or Chemical Variation?Not always easily detected. ?May be noticed in all parts of the Body, even between very closely related Forms?Exists not only between different Species, but between Varieties of the same Species, Individuals of the same ' Variety, and even different ages of the same Individual?Chemical Variation explains Racial Immunity to peculiar Diseases?This Chemical or Physiological Variation in some cases of much higher import than any Morphological Variation?Chauveau's Experiments on Bacillus anthracis?Physiological Differences between Brown and Green Frog towards Poisons and Heat?TarchanofFs Experiments?Variation generally exists at all Ages, in all Groups of Beings, at all Geological Epochs?Sudden Variation. There is a last form of variability to which I wish to call attention, and which has not been enough taken notice of up to the present time. I refer to what I have mentioned under the name of chemical or physiological variability. Under this name I include all facts which indicate a difference in chemical or physiological constitution, expressed through differences in the reaction of the organisms towards definite and common external influences. Such chemical variation must certainly exist at the basis of all specific or even racial characters, and if I dwell somewhat upon the topic, it is owing to the fact that this sort of difference has not been as much investigated as it ought to have been. Between two species, however closely allied, between two varieties or races of the same species, there are not only those slight external differences upon which so much stress is laid by morphologists; there are internal, chernical and physiological differences which are mos...


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Product Details
  • ISBN-13: 9780217716192
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 68
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 0217716199
  • Publisher Date: 19 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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Experimental Evolution; Lectures Delivered in the Summer School of Art and Science, University Hall, Edinburgh (August, 1891)
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