i Department of Genetics
University of Wisconsin

., Dater March 2 ~
Madison 6, Wisconsin aren 232 1954 >
Original Notice Shipping Copy (?— Acknowledgment of
(First Class Mail (Enclosure with receipt
shipment)

(Please return)
Dr. J. Monod .

To: Institut Pasteur
28 rue du Dr. Roux
Paris XV? France

W~2417 Mm "Cat+" Lac), (tentative). The Lac” ds epistatic to Cst+
and is, as far as we can determine ang "absoilhte negative",
worthwhile to test for Pz, .

W478

These cultures have been
checked, Please notify me of any difficulties or untoward behavior,
For future reference, I

i your preserving the designations
of these cultures in your records,

Esther & Joshua Lederberg -
. Associate Professor of Genetics