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On Hamburger's method of mounting embryos in toto in plastic.
On Weiss' appointment as visiting professor of zoology at Washington University.
Obtaining collagen
Private letter on Weigold's health condition.
Request for tantalum foil to insert in early chick embryos. On discrepancies in the mecahnism of sensory and motor hypoplasia.
Typewritten letter, 1 page
Apology for earlier letter
Hamburger's permission to publish corespondence between himself and Schmitt written on May 9, 1941
Invitation to lecture at Washington University.
On a draft version of Twitty's paper and Holtfreter's considerations. Enclosed a letter by Holtfreter (November & December 1964) on Twitty"s manuscript.
Thank-you note for a picture.
Private letter. Has message by Gertrud 'Trudl' Wiehen.