danuory BY, 1951.

Difco Laboratories,
Detroit 1, Michdean.

Genéténen:

I hepe that the fellowing suggestion oan be brought to the attention
of the appropriate officer of your company. .

Tie metcl cans in which yeu new supply Bacto Arar, in one pound
lote,are attractive ani spprosricts to their use. It turns out, unfer-
tunately, that they are juts a few millimeters too nerray to accenodate
the lide of stondord 10 on Petri plates. I think that a good many bae-
teriologiste vould lita to be able to make uns of these oylintfical
cana, rather than diecard thes when empty. For example, I would like
to have them fer refriparater oteracs ofe7all batches ef plates.

Would there be ony possibility of making thie slight alteration
in the dinveter of thesa cans without dislecating your shipment ochedutes?

Yours sincerely,

Joshua Lederberg,
Aesoolate Profeccor ef Genetics