4+

1 C-
gl:

Dept. of Bacteriology & Immunology, (Ce
3775 University Street.

 

McGILL UNIVERSITY
MONTREAL

January 24, 1958.

Dr. J. Lederberg,
Department of Genetics,
University of Wisconsin,
Madison,
Wisconsin, U.S.4,

Dear Dr. Lederberg,

In a paper entitled Genetic exchange in Salmonella
submitted by you and Dr. Norton D. Zinder to the Journal of

Bacteriology for publication on April 18, 1952, you describe

"a U tube with an ultra-fine sintered pyrex filter partition..
«+ prepared according to Davis's (1950b) design." I referred
to Davists 1950 paper, Ne describes "a U tube 25 mm. in dia-
meter partitioned by an tultra-fine't fritted disc (Corning)."
The latest *Corning' catalogue does not describe such a piece
of apparatus,so I presume you had these tubes custom made; or,
less probably, Corning has discontinued this line.

I am extremely interested in using such a U tube in
work on metabolism of certain pathogenic fungi. Would it be
possible for you to send me a description of how you obtained
these tubes and at what cost. I would be most grateful.

Yours very truly,

Leith, Comerkore

Edith Common,
Research Assistant,
Mycology Division.

Couns etl. he full dh Veualh, demet Goch When 24 arog

flee. Hnartartr,, My. Mawnan Carney Or enor , Wisconsin , wl parte
be gtod To acerpt pyr ridin, Ye wan mens ComyalN Gh colburer.

92