April 7, 195h

Dr, Gardner Middlebrook
Research jjirector

Nat'l Jewish Hospital at Denver
3300 East Colfax Avenue

Denver 6, Colorado

Dear Br, Mid@lebrook:

I was delirhted to receive your letter of April 1. Of course if
I should have any opportunity to visit Denver, I will not neglect the
chance of visiti:r you and your laboretory, In general, our summer
trips have tended to alternate east and west, and this year's direction
will be Woods Hole, J have been very much interested in the findings
that have been presented by yourself and by Mitchison on the ecology of
drug resistance in tuberculosis, If there were any specific wey in
which I could be of any assistance I wonld be ple sed tc hasten to do
806

Mey I take this occasion for an appeal to you for your earlicr
papers on variation in tuberculosis? I must admit that my interest
in this tople is not yet matched by the backreround of my information

A recent visitor in our laboratory was Professor &, Rubbo from
Melbourne who will possibly be coming out your way within the next
several weeks, I hope he will have noted your address, but if not
he may be getting touch with Puck, In any event T hope that he does
have a chance to meet you as he has been workire himself in related
problems of chemotherapy of tuberculosis,

Yours sincerely,

Josma Lederberg,
ssociate Professor of Cenctics