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Central Laboratery of the Kupat Holim(Jewish Workers Siek Fund),
ccecossesestatveseeseeesesessaul une Haifa,P.0.B.954,Israel.

Oetober 25,1952.

Professor Joshua Lecerberg,
Department of Geneties,
University of Wiseonsin,
Madisen 6 Wis.

Dear Prefesser Lederberg:

I am very sorry I eould not answer you earlier.
I was glad to lernm from your letter of September
17 that my strain of a nom-motile H form ef S.paratyphi B might be of uss
in your genetie studies.The eultures have been well preserved and I am

sending to you a pareel by air containing:

1/2.The non-motile H form from the first isolation( No.1415),one eulture

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subeultured from a eolony in the l.phase,the other from the 2 . phase.

3,.The O ferm found during the seeond isolation(Ne. 2859).

4.The normal H ferm,obtaimed on swarm agar from the O form,as the H form

whieh I get during the seeond iselation,had apparently died out. Although
the O form had been preserved in a apparently pure state,it was very
easy to get a well flagellated amd beau@ifully motile H form on the
swarm agar.

I eam easily replaee the non-motne H form eul-
tures by others,yeunger ones,as the woman is from time!eoming up to our
laboratory and some time age we eould again isolate ‘non-motile H forms

of optimal H agglutinability from her feees.

I am ineluding a reprint. Yours sine ly,

WY

We Hirseh,! M.