Professor Simon Rottenberg, Roosevelt University, 430 South Michigan Ave., Chicago 5, Illinois. February 19 1962 Dear Professor Rottenberg: Please accept my best thanks for your kind letter of February 6 and the invitation you extended to me on behalf of the Roosevelt University. It would be a pleasure for me to accept your invitation and to deliver, during the Spring months, a lecture at your University. Unfortunately I have for the coming months so many commitments that I cannot consi der any further speaking engage- ments before the month of October. Please excuse my declination, Kindest regards, Sincerely,