May 2%, 1955
Dear Norton:

Eather ami I much appreciated your hauling us about, not to mntion your com
pany. We had an excellent visit.

We talked about followaing your unstable-lysogenicitg—mitant in chains. I can see
enough difficulties that it may be hard to do a clean experiment, but having it around
if you care to semi it, may help impel doing it.

I checked your terminal report on Fla+ transduction —x SW 543. It leasta 27 tests
altogether, with FA; all give b's, 7 gave i's also. There were 71 control tests
(not{ spec. whether no FA, or heated FA), but only 7 gave any motiles, 4of then
i, 3b. In conversation, you implied you had gotten several dosen more spontaneous
reversions—- do you have more data, or did you mean you had done the 71 at tempts?

Youys giocerely ’

RON A,

oshua Lederberg