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Correspondence

On finishing the last chapter of their book manuscript. Mainly private letter, sending Season's greetings and x-mas gifts.
On his birthday and christmas. On Hamburger's upcoming visit to Boston.
On his upcoming talk at the New York Academy on January 10 and a recent talk at Columbia. Thank-you note for christmas gift.
On his visit to Woods Hole. Mainly private letter.
On his upcoming teaching duties in Embryology etc. in Rochester.
On his recent visit at Hamburger's home. On his upcoming teaching and instutional duties in Rochester.
Thank-you note regarding Holtfreter's recent visit at Hamburger's home.
On a case of fire in his house and the loss of preparations for two manuscripts.
On the approval of his US immigration visa.
On his studies on Amphibian Exogastrula.
On working with Amphibian eggs provided by Twitty, Male and Ballard. On producing neuralization in ectoderm by changing the salt comcentration, the ph, or the Ca content of the solution.
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 an article by M. Rose in Scientific American, December 1958, misinterpreting Holtfreter's experimental results on feedback action in embryogenesis.
On his social life. On the upcoming Growth meeting.
On the differentiation of a multicellular organism. On Spemann's organizer. On the status of embryology: "The prominent position of embryology, held for 50 years previously, has been lost." On the critical reception of Weiss.
On his recent trip to Puerto Rico.
On Yamada's financial situation in the US.
On their recent symposium in Washington. On Paul Weiss. On the "modern version of a scientist" and other self-images.
On his invitation to the Montevideo Miedical School in Uruguay.
On the outline of one of their book chapters.
On Holtfreter's draft version of the last book chapter. On different styles of scientific thought in Europe and the US. On Paul Weiss.
Mainly autobiographical letter. On his present situation in Montreal. On his trip to Bali and his malaria studies at the Hamburg Tropeninstitut. On Hamburger's recent work on medullary plate formation. On F. O. Schmitt's article on 'Zipper principle'. On Waddington and induction: "Thus the induction has slipped again through our fingers like jelly, and we are almost back where we have started." [This quote was marked by Hamburger.]
Proposing a textbook on Embryology by Holtfreter and Hamburger. On the completion of his recent manuscript.
Requesting information about the Growth Meeting and Hamburger's experiences in Woods Hole.

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