| LUFTPOST /
PAR AVION /

‘Sve f
The International Salmonella & Escherichia Centre Ors
STATENS SERUMINSTITUT

DIRECTOR: J. @RSKOV, M. D.
COPENHAGEN S. — DENMARK
TELEPHONE: ASTA 2817
TELEGRAMS: STATSSERUM, COPENHAGEN

Dr. and Mrs. Joshua Lederberg 11/2, 1959.
Department of Genetics

Stanford University

California

U.SeAe

Dear Esther and Josh.

How are you in the new settlement?
Thank you very much for the photos. We certainely enjoyed them,
especially the big one with both of you.

I guess that you have already received the two sera, W614F
and W3703Hfr. They contain 1% chloroform and 0,1°/00 merthiolate. If
you think it necessary add once again one or both constituents in the
same p@Pcentage. We are anxious to hear whether you will find the sera
useful or not. If you don’t mind, and can spend the time, we will ask
you to go through our F paper, which will be finished in a short time,

we hope. We will write later about that.

The Well decoration is almost on its way, ‘how is it with our

joined paper?

Best regards

LTR

Ida.

F. S$. “Tuy Ba vl Laan plot, pupae rt
yye Ut sera Artaud To ww
poem c-cd 0, L8 Yo.