February 5, 1957

Dear Francois:

I am very much gratified to have your formal invitation to address
The Club de Physiologie Cellulaire. Of course you know what you're
getting into, if I speak in French, but I will try.

If ite is important that fhe meeting be held on Friday evening, I
could agree to speak on the 8th March; however, this is the next day
after my arrival, and I may not be as fit for the ordeal as, saym the
next Monday. I am quite happy to put myself in your hands— please
use your best judgment.

Our current planned itinerary is to arrive atx at Faris on Thursday
morning, March 7, at 1000, on Air Franos flight 060 (tourast). We plan
to remain until the following Tuesday, departing 7PM for London on
AF 590.

Please dh not bother yourself about the exchange problem any further.
I will have to do som further travelling in the U.S. after returning
from London, and at worst can use any ‘surplus' of francs to kgougx
buy my tickets in Paris.

My title should remain 'Le mecaniame genetique de'phase variation!
flagellaire antigenique chez Salmonella’.

May J ask you to send me your current reprints a& svon as you con-
veniently can? I am writing a review on Reooabination Genetics, and
would like to cover everything published through 1956, as far as possible,

We have mich to discuss scientifically—- as we shall in person.
Kether has some very intriguing results on the segregation both of ©
lambda and of F434 from heterogenstes.

Yours sincerely,

be
‘

  

é
« dys Leen
; Lederberg

P.3. Can you suggest anything we should partigularly
bring with us? (Considering how often you and your
Colleagues ‘co:mute'’ across the Atlantic, this is
perhaps a silly question.)