January 7, 1947.

Dear Harriett,

Your note of the 18th(or so), received just yesterday, mst
have crossed my Christmas Day airletter in passage. The card, of
eourse cleared up ay confusion. Let ne wish you every happiness,
Harriett; I hope you will enjoy your marital adventures ss thoroughly
as I have, and please transmit my congratulations to Dr. Ephrussi.

There was a fuirly interesting set of meetings at the AAsd in
Chicago last week. » symposium by Sonneworn and his gang was outstaning;
you may not yet have heard that T.M. has succeeded in "infecting"
Kk sengsitives with kappa from concentrated breis of killers. Gus
Doermann aiso had an interesting account of his enumeration of growing
phage (using lysis from without) suggesting that the initial course
was autocatalytic, but that later growth; pbobably due to Limiting
rate of synthesis of substrate was arithmetic. V. Wagtendonk a
sented some fairly good enzymatic evidence (4 la MeCarty) that paramecin
was a dssoxyribonucleoprotein. Met Dave Perkins there, finda that he
is embarking on a study of smut genetics for his thesis work.

I wish we could come ober some time, and we asy by 1950 or so,
but nor before then. 1 hope though that you will not be too busy to
correspond occasionaily.

There will be some reprints in the mail soon. fill you divwy them
with Ephrussi?

Esther sends her best.

Sigcerely,

Joshua.