May 31, 1954

Dear Dr. Iseki:

If wish to note with my thanks your cordial sending of reprints
of papers by your colleagues and yourself on Salmonella variation.

Unfortunately, I have to report that shortly after receiot the
group of papers received sometime during the last few months has
disappeared from my files, ami I have not been able to find them
despitsthe most thorough search.

I would deem it a special favor if you could replace this loss,
as well as to continue the regular exchange if publications of mutual
interest. For your record, the papers I do have in my file from your
department are:

1) Artificial transformation of O antigens in Salmonella E group:
papers I and II only (Trans. Jap. Acad. #30, 31)

2) On V loss variants: # 86, 102
3) From the safte journal also: # 85, 100, 101, 39, 50,103
4) From Gunman Jour. Med. Sci., 1:1-21; 219-222.
You can be sure I have bsen following this work with the deepest
interest.

Yours sincersly,

Joshua Lederberg
Associate Professor of Genetics