Maruh 8# 1951.

Fmfesror c. A. stuaPt,
Departaont of Biology,
Brown Univerrity,
PPovidenQo 12, Ii. I.

Deim Profeuor Stuart:

Xa rempwmr to your latter of t&o fit&, f am plearred to rend herewith
the five culturu uhinh you requerted. However, in pl.me of W-677 I put
W-1177, it6 S' (rtreptoqwln-re6imt6nt) mdant. If thils i6 wmatiriactoq,

plea80 let m know.

The attauhed sheet 6wnarS.6es 001~ partfoularr about the 6tmi.m. You
will find that Y-33 aarriar a *artabile@ laatooe-negs8ive eharaoter, while

that 48 W-4177 i6 stable. The other aharaeterm are l&wise stablo, but
                                                  L

you may have ww dtifistitg in raoring the Gal- and Ara- <sharwterr of

-%ll77, and I would not pwomamd ueFng thea unlerr nso66aPcy.
the first aentenoe of ywr lettar was apparanf;ly pied in dbhUon#

and I an not oery olear a6 to precisely what you ByIant, althou& the
gist is dle6r. The ohly 6erologiaol data mu available 6re that (ace. to
Kauffaann ) K-12, Y-40 and Y-33 all *give a weak agglutination in 0 6era

4, 3.4, and 16, but don@ t belong to thr moot f rsquently cmurring 0 groups.

They are probabb not crapsule typea.... " We have been prepw* sera for

K-12 and interfertile rtraim, but have not yet alemed up the O-K-H eon+

ponenta.

Sinaerely,

   Joshtm Lederberg,
Arroaiate Prsferror of Chbnetl86