Appendix II., p. [536].
Acræa and the Maracujà butterflies as larvæ, pupæ, and imagines, [536].
Explanation of the Plates, p. [546].
Part III.
ON THE FINAL CAUSES OF TRANSFORMATION
(continued).
III.
THE TRANSFORMATION OF THE MEXICAN AXOLOTL INTO AMBLYSTOMA.
Introduction, p. [555].
Experiments, [558]. Significance of the facts, [563]. The Axolotl rarely or never undergoes metamorphosis in its native country, [565]. North American Amblystomas, [570]. Does the exceptional transformation depend upon a phyletic advancement of the species? [571]. Theoretical bearing of the case, [574]. Differences between Axolotl and Amblystoma, [575]. These are not correlative results of the suppression of the gills, [578]. Explanation by reversion, [581]. Cases of degeneration to a lower phyletic stage: Filippi’s sexually mature “Triton larvæ,” [583]. Analogous observations on Triton by Jullien and Schreibers, [591]. The sterility of the artificially produced Amblystomas tells against the former importance of the transformation, [594]. It is not opposed to the hypothesis of reversion, [596]. Attempted explanation of the sterility from this point of view, [597]. Causes which may have induced reversion in the hypothetical Mexican Amblystomas, [600]. Saltness of the water combined with the drying up of the shores by winds, [604]. Consequences of the reversion hypothesis, [609]; Systematic, [609]; an addendum to the “fundamental biogenetic law,” [611]; General importance of reversion, [612]. Postscript; dryness of the air the probable cause of the assumed reversion of the Amblystoma to the Axolotl, [613]. Addendum, [622].