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.

    41/698 (page XXXIII)
    Contents. xxxiii VIL Phyletic Development of the Markings of the Sphingidœ. Suimnary and Conclusion, p. 370. The oldest Sphingidœ were devoid of marking, 370. Longi¬ tudinal stripes ihe oldest form of marking, 371. Oblique striping, 373. Spot markings, 375. The first and second elements of marking are mutually exclusive, but not the first and third, or ihe second and third, 377. Results with reference to the origin of markings; picture of their origin and gradual complication, 380. General results ; rejection of a phyletic vital force, 389. II. ON PHYLETIC PARALLELISM IN METAMORPHIC SPECIES. Introduction, p. 390. I. Larva aiid Imago vary in Structure independently of each other, p, 401. Dimorphism of one stage only, 402. Independent variability of the stages (heterochronic variability), 403. Constancy and varia¬ bility are not inherent properties of certain forms of marking, 407. Heterochronic variability is not explained by assuming a phyletic vital force, 410. Rarity of greater variability in рирж. Greater variability more common among caterpillars than among the imagines. Causes of this phenomenon, 412. Apparent independent variability of the single larval stages. Waves of variability, 416. Saturnia Caan instance of secondary variability, 419. Causes of the exact correlation between the larval stages and its absence between the larva and imago, 429. IL Does the Form-relationship of the Larva coincide with that of the Imago Ì p. 432. Family groups, 432. Families frequently completely congruent 435. Exception ofíered by the Nymphalidœ, 435. In transitional families the larvse also show intermediate forms, 441. Genera ; almost completely congruent ; the NymphaUdeous genera can be based on the structure of the larvse, 444. So also can certain sub¬ genera, as Vanessa, Incongruence in Fterogon, 450. Species; incongruence very common ; б. Ocellatus and Populi, 451. Species