July 21, 1953
Dear Borts:

Whtle i was yolng over our correspondence to see if anything else
should go with the anciosure, i noticed your ietter of Nay 3i, and no
record of any answer to it. | must apologize very sincerely, and can only
hope you will use your imagination In connection with the enclosure to
understand some of the distractions.

I don't really have any serious conment on tne Pardee & Trucco work;
Strominger is very critleai of it on technical grousds=- i have nv strong
opinions one way or the other. i have dene ncthing new with protuplasts In
the last six months, having been aitesether preoccupied wich cul leborating
with Cavalli on Interrupred mating analysis. | never got anything with
onaw°x experinencs and an sure Chargaff is <i. wet, gust on tne face of his
own evidence 1 suspect he thinks so too now. However, Dale Balser (who
witl be a colleague ut Stanford) hws been getting Gal trensducction with
disrupted lambda pius additional phage, and this may te a good lead, |
shouia think chere wogid be sone point to your concinuing with upiake
expts. Did you see the observations of Doty and Marmur that smal] pieces
ti vis. aire nut taken up by pneumococci! as weil as iarge?

i hope chere .5 no danger of our missing you this trip. We wili be
back on September 11 (returning from Stockholm via London and San Franscisco;
as you know we aiways cake the shortest routei} If there js any doubt about
it call us up. 1! am sure we can make some contribution to your travel expenses
if this is the iimiting consideratioa,

3s

i don’t know 7 the serains you asked for will do any gooi, but i
will try ap have then sent out before wa leaba. We may not have a LacyGal.”
protoproph but | will leok, Aaron Novick (who Is going to move tp the University
of Oregon, Eugene, Ore., this fall) thinks that galactose may be taken up
Jiternutivaly by the galactoside or ak by another glucose permzase.

What ave your two thyafnelass strafns-~which coll strains do they
come from?

We will be leaving July 25, but you can reach us before August 10
c/o Dr. &. Klein at the Karolinska Institute, Steckhole, or ny seeretary here
will forward mail so marked.

Gest wishes to R* ita and J'a,

Yours

Joshua Lederberg