September 15, 1960

Or. A. G. Marr

Department of Bacteriology
University of Celifornia
Davis, California

Dear Gerry:

| just got back from a trip and one of the things | was looking
forward to seeing was the bibliography you promised me on the spectrophoto-

metry Of turbid suspensions. This will be equally welcome whenever you can
send It.

You will have caught the slip on the flow sheet on the diagram 8-4:
the fraction that Is saved for further examination should be labeled
d < 1.2.

Since talking to you | have had one or two leads on a possible
research associate in exobiophysics but they are not so very promising and
| would be delighted If you can suggest any names.

Yours sincerely,

2H ‘ya tty

Joshua Lederberg
Professor of Genetics