November 9, 1956

Dear Daw:

Thanks for the mamage message ani list. It's too bad you didn't
let us buy some extra reprints. We'll have a few én hand in extremis.

We(ve been running into prélinelesa mtants almost everywhere; I
think it may have more to do with storage in stab-tubes than with F.

I am sorry to have to adait that I've been sitting on a writeup
of the P/poility story, will get to it as scon as I can for your approval
as 2 Skaar-Richter~—Lederberg note. I'l] keep in mind your availability.

Bill Stone ani Wilmer were waiting to hear from you. Should should
get in touch with Bill pdq.

The Yrskovs have gotten here, and are well under way (together with
some hundreds of type coli sera). At last we're in a position to get
this immnogenstic stoyy done right. I hope you read no criticism into
this-- it's obvious this type of work has neaded better resources than
you or I could command. We've been screening (and rescreening) the sero-
logical type cultures (0, K and H) from Denmark for fertility} a fair
fraction are suitable. There are some tricks about colony selection too.
You may be interested in the typing of some cultures you worked with:

we ° K H>

1 ~ 30? new K's not routinely
3 8 ~ done,

4 25 ~-

15 86 12

17 41 ~

a 40 13

2 1 12

som of which were anticipated or substantiated by your reverse-typings
of the serum.

Because of the rough condition of the cultures, and the availability
of the type serums for the new series, probablg mgst of this work will be
on the standard type cultures, but they are also looking at wg3-4 to see
if some of your earlier findings can be interpreted in factorial terms.

Sincerely,

Joshua Lederberg