I. On the structure and development of the the skull in the batrachia. —Part III

Abstract

My first attempt at working out the morphology of the Batrachian skull (Phil. Trans., 1871), instead of satisfying my mind, only served to increase tenfold the desire to know the meaning of the mysterious changes undergone by that part—the main part—of the organisation of the Frog. Since then no opportunity has been lost of laying up in store fresh and fresh materials for further work in this field of research. Moreover, an additional strip of ground has since then been cleared and cultivated (Phil. Trans., 1876); in that second essay I was greatly helped by Professor Huxley, who showed me what was wrong in the first attempt, and also cut through some of the thickest and thorniest parts of this tangled subject.