Studies in the theory of descent / by Dr. August Weismann...with notes and additions by the author; tr. and ed., with notes, by Raphael Meldola...with a prefatory notice by Charles Darwin...with eight coloured plates.

  • Weismann, August, 1834-1914.
Date:
1882
Catalogue details

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

Credit: Studies in the theory of descent / by Dr. August Weismann...with notes and additions by the author; tr. and ed., with notes, by Raphael Meldola...with a prefatory notice by Charles Darwin...with eight coloured plates. Source: Wellcome Collection.

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    CONTENTS. ^3art I. ON THE SEASONAL DIMORPHISM OF BUTTERFLIES. I. The Origin and Significance of Seasonal Dimorphism, p. i. Historical preliminaries, i. Does not occur in other orders of insects, 4. Beginning of experimental investigation, 5. Lepidop- terous foes, 7. First experiments with Araschnia Levana, 10. Experiments with Pieris Napi, 13. Discussion of results, 17. Origination of Fror sa from Levana, 19. Theoretical considerations, 23. The case of Papilio Ajax, 30. Experiments with Pieris Napi гаг. Bryoniœ, 39. The summer generations of seasonally dimorphic butterflies the more variable, 42. П. Seasonal Dimorphism and Climatic Variation, p. 45. Distinction between climatic and local varieties, 45. The case of Euchloe Belia and its varieties, 47. The case of Polyommatus Phlœas, 49. The case of Plebeius Agestis, 50. III. Nature of the Causes producing Climatic Varieties, p- 52. Seasonal dimorphism of the same nature as climatic variation, 52. How does climatic change influence the markings of a butterfly? 52. The cause of this to be found in temperature, 54. Part played by the organism itself, 58. Analogous seasonal dimor¬ phism in Pierinœ, 60. The part played by sexual selection, 62.