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Detailed description (including several drawings) of Holtfreter's recent observations on Xenopus gastrulae. On induction.

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On his difficulties at University of Rochester. On his recent experimental work: "Lately, Hiroko and I have been very busy to unravel the mysteries of the embryo."

On the importance of embryology for cancer research: "Der Unterschied wuerde hinfaellig werden, wenn es uns edlen Embryologen gelaenge, all die aufghehaeuften Weisheiten der Genetic (sic!), Embrologie, Microbiologie, Immunologie, Biochemie und Pathologie zu verdauen und dem Leserpublikum so mundgerecht zu machen, dass nur wir Embryologen den Schluessel zum Krebsproblem in der Westentasche haben." On his X-ray experiments.