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

  • Patrick Geddes
Date:
1889
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Licence: Public Domain Mark

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

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    CHAPTER XII. PAGE Theory of Fertilisation - . . . . 157-168 § I. Old theories— (a) Ovists, {I?) animalculists, {c) the aura seviinalis. § 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 Bary, 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. (<;.) A source of variation. Brooks and Weismann. CHAPTER XIII. Degenerate Sexuai, 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. § 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 . - . . . 188-199 § I. Artificial division. § 2. Regeneration. § 3. Degrees of asexual reproduction. § 4. Asexual reproduction in plants and animals.
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