Monday P.M.
Mar ch 7, 1%9.
Via AIRMAIL

Dear Max,

Please disregard my comments on the Xyl segregation in"H-72". My
copy of the culture I sent you is Xyl/, not segregating for Xy}, and
probably means that H-62 was sent you instead, which is essentially

the same except for the Xyl segregution. I am reisolating H-72 from
older stocks,and will also have some others like it, very soon.

With my apologies,

Sincerely,

Joshua Lederberg