The evolution of sex / by Professor Patrick Geddes and J. Arthur Thomson.

  • Geddes, Patrick, Sir, 1854-1932.
Date:
[1900]
Catalogue details

Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: The evolution of sex / by Professor Patrick Geddes and J. Arthur Thomson. Source: Wellcome Collection.

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    xiv COXTENTS. CHAPTER XII. PAGE Theory of Fertilisation .... - 157-168 § i. Old theories— [a) Ovists, [b) animalculists, {c) the au7'a seminalis. § 2. Modern morphological theories— (a.) Nuclei all - important. Hertwig, Stras¬ burger, &c. {b.) Cell-substance also important. Nussbaum, Boveri, &c. § 3. Modern physiological theories— Sachs, De Вагу, Marshall Ward, &c. Cienkowski and Rolph. Weismann's view. Critique and statement of present theory. § 4. Use of fertilisation to the species— {a.) Rejuvenescence— Van Beneden and Biitschli. Galton and Hensen. Weismann's critique. [b.) The observations of Maupas. {c.) A source of variation. Brooks and Weismann. CHAPTER XIII. Degenerate Sexual Reproduction or Parthenogenesis 169-187 § i. History of discovery. § 2. Degrees of parthenogenesis— Artificial, pathological, occasional, partial, sea¬ sonal, total. § 3. Occurrence in animals— Rotifers, crustaceans, insects. § 4. Occurrence in plants— Phanerogams and fungi. § 5. The offspring of parthenogenesis. I 6. Effects on the species. § 7. Peculiarities of parthenogenetic ova— Weismann's discovery. § 8. Theory of parthenogenesis— Minot and Balfour. Rolph and Strasburger. Weismann. The present. § 9. Origin of parthenogenesis. I o. Case of bees. CHAPTER XIV. Asexual Reproduction - . . . . 18S-199 § i. Artificial division. § 2. Regeneration. § 3. Degrees of asexual reproduction, § 4. Asexual reproduction in plants and animals.