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On his visit to Cambridge, MA.
References for the bibliography of "Analysis of Development".
Detailing results of the last 14 years of research.
On a symposium on evolution and development at the Zoological Meetings at Penn State in August. On Holtfreter's experimental work. On Rita Levi-Montalcini.
On Hamburger's draft of the first book chapter. On Paul Weiss.
On Yamada's financial situation in the US.
On chapter VIII of their book.
On the publication and the illustrations of "Analysis of Development".
On the ilustrations of "Analysis of Development".
On Holtfreter's upcoming talk.
thank you for reprints, discussion of cyclical activity in older chick embyos and cyclical self-generated activity and adult goal-directed behavior
On Holtfreter's election to the Academy: "It is also a recognition of our old-fashioned brand of Exp. Embryology, and of the solid foundation of our Spemann type of outlook, enriched a bit by exposure to the New Look."