Text
Typewritten letter, 1 page
Typewritten letter, 2 pages
Invitation to prepare a manuscript on "Recent Concepts of the Embryonic Inductor" for the Quarterly Review of Biology.
On Caspari's concept of differentiation.
Written from Italy during World War II
On Holtfreter's review in 'Archives of Biochemistry'. On the proofs of Hamburger's review. On the Army Students Training Program.
On his difficulties with graduate students.
Typewritten letter, 1 page
On the revised edition Hamburger's "Manual of Experimental Embryology. On Waddington's & Rensch's recent Darwin talks at Washington University. On Hamburger's current "lack of inspiration".
Typewritten letter, 1 page
On the review process of Sol Spiegelman's manuscript. On his talk at Cold Spring Harbor on the effects of sex-linked genes on the melanophores.
On Hoerstadius and his monograph on the determination of the cartilaginous skeleton of Urodela.