Correspondence
Typewritten letter, 1 page
Typewritten letter, 2 pages
Typewritten letter, 1 page
Typewritten letter, 1 page
Typewritten letter, 1 page
Typewritten letter, 1 page
Nomination letter as Associate Member of the Society of Zoologists for Walter N. Hess.
Photocopied letter, almost illegible
Scheduling meeting
Welcomes Harkmark to study in lab
Next year is fine for visit
Unable to come to Hamburger's lab this year
Wilhelm Harkmark visiting from October through December 1956
Response to Harkmark
Letter about visit
Comments on manuscript
Invitation as a guest lecturer at Hamburger's department at University of Washington.
Letter of recommendation for Watterson for promotion to full professor at Northwestern.
Discussion of upcoming AAAS Meeting at Berkeley and presentation of research on lumbar spinal cord
Invitation to Schleidt to visit, offer to pay expenses
Invitation to Schleidt to visit
thank you for reprints, discussion of cyclical activity in older chick embyos and cyclical self-generated activity and adult goal-directed behavior