May 9, 1949.

Dr. Sk. Luria,
Dept. Bacteriology,
Indiana University,
Bloomington, Indiana.

Dear Lue

I've just bean reading your and Dulbecco's paper in Genetics. If possible
can you reeerve 2 or 3 reprints for me, for clase use? Thanks.

On p. 103. 3th paragraph, I'm not quite clear what correction you use
for aative phage. In order to mke w correspond to y, I take 1t that you
want to aliminate infective centers starting from cells singly infected,
and therefore with an active particie. The expression for y seems to include
cells multiply infected all or in part with active phage.I don't suppose
this fs very vital for values of r more than 2 or 3, or anywhere that
w » eT, but i'm curioua to know how you handled this problem. From the

paner, I might have inferred that the correction was merely total active _ A
phhgo (s~*) or total infective centere containing active phage (1- -—Ke )

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possibly rather than cells singly infected with active phage,
(xe -*). Sie

It just occurs to ma that where reactivation fis very slight, as in Tl,
or with X-rays, this mtter might be very imortant. Lat ae know what you
think,

Are you going to Cinnoinnati? If I see you there, I'd like to see whether
we can arrange to go out to Shelter Island together from the airport.

Sincerely,