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
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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.

    42/698 (page XXXIV)
    xxxiv Contents. of Deilephila show a nearer form-relationship as imagines than as larvae, 454. Systemy not only the expression of morphological relationship, 455. Varieties; incongruence the rule; seasonal dimor¬ phism ; climatic varieties; dimorphism of caterpillars; local varieties of caterpillars, 456. Result of the investigation, 458. Causes of incongruence, 460. A phyletic vital force does not explain the phenomena, 461. This force is superfluous, 464. III. Incongruences in other Orders of Insects, p. 481, Hymenoptera. The imagines only possess ordinal characters, 481, Double incongruence : different distance and different group-forma¬ tion, 483. Diptera, 488. The larvae form two types depending on different modes of life, 489. The similarity of the grub-like larvae of Diptera and Hymenoptera depends upon convergence, 494. These data again furnish strong arguments against a phyletic vital force, 496. The tribe Aphaniptera, 498, Results furnished by the form-relationship of Diptera and Hymenoptera, 499. Difference between typical and non-typical parts transient, 501. IV. Summary and Conclusion, p. 502. First form of incongruence, 503. Second form of incongruence, 506. General conclusion as to the ehmination of a phyletic vital force, 511. Parallelism with the transformation of systems of organs, 513. Appendix /., /.520. Additional notes on the Ontogeny, Phylogeny, &c., of Caterpillars. Ontogeny of Noctua larvae, 520. Additional descriptions of Sphinx- larvae, 521. Retention of the subdorsal line by ocellated larvae, 529. Phytophagic variability, 531. Sexual variation in larvae, 534. Appendix II., p. 536. Acrœa and the Maracuja butterflies as larvae, pupae, and imagines, 536. Explanation of the Plates, p. 546.