Professor Pieter Nieuwkoop has made numerous contributions to amphibian embryology over the past 40 years. These include his formulation of the normal table of Xenopus development, the analysis of regional aspects of neural induction, the discovery and analysis of mesoderm induction, the discovery of the inductive formation of germ cells in urodeles, studies of the cytoplasmic organization of eggs, and the study of the evolution of land-adapted vertebrate eggs. He has sought an understanding of epigenesis in vertebrates through his observations of morphology and through the methods of experimental embryology. Since the body of information represented by his work is less and less familiar to contemporary researchers, I have provided him with a list of questions that might encourage him to summarize in writing some aspects of his purview.

My training in embryology began with the arrival of Dr Chr. P. Raven as Professor of Zoology at the State University...

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