Correspondence
Short note on Twitty twin genes and Ambylstoma backcrosses in reply to Hamburger's letter. Twitty mentions Lipsett's hybridization of A. tigrinum & A. mexicanum.
Discussion of meeting with Ronald Oppenheim and behavioral embyology
Note on Triturus eggs sent to Hamburger. On his concerns on spending the summer in Woods Hole. Short note on his collaboration with Lehman and on Takahashi.
Letter from Norway
Handwritten letter, 2 pages
On the application of Miss Eggers.
On the Growth Society and their next symposium.
On his poem for Baltzer's birthday.
On his revision of the Vertebrate Embryology article in Encyclopaedia Britannica.
On his invitation to Woods Hole he received from Hamburger. Short note on Paul Weiss. Probaby attached a 2-page proposal by Twitty on the exchnage of amphibian material for experimental embryology.
Handwritten letter, 3 pages
Twitty talks shortly about summer meetings in Bloomington.