ino? INSTITUT PASTEUR PARIS. ur 2 mai dsl 25, RUE pu DocTEeuR Roux (XV® ARRONDT™) TELEPHONE : SEGUR 01-10 (7 LIGNES GROUP&ES SOUS CE NUMERO) Dr. J. LivditBeRG Dept of Genetics University of Visconsin I ADISON wa wisconsin Jear vr. Lederberg, I tank you very much for your letter. I hud asked you the sensitive strain of E~-I2 to estimate the phaze produced ky the lysogenic 4-18, I am sending you our reprints on lysogeny. Very sincerely yours, ad] {