July 19, 1946
Dear Beets:
Thanks much for the reprint -- and for the tryptophane etc. cultures.
We've been running into a little difficulty in interpreting some of the morphological types coming from no treatment, or after mustard or especially methyl-cholanthrene treatment.  These fall into 3 main types, flat, pink-fluffy, and [ . . . ] -- and reach approximately 10 percent of the isolates from 25a x 1A.   Has any track been kept of these types from the Stanford isolates?  Were planning on using inorganic stocks when theyre [sic] made.
2ndly -- S-mutants (cystine and methionine) have run close to 25 percent of the total biochemicals from mustard.  Is that what the radiation isolates ran.  Did Norm find a disproportionate number with mustard gas?
3rdly -- To the best of my knowledge, no [ . . . ] biochemicals have come from untreated stocks -- i.e. spontaneous -- in N -- is that still true?  We've done close to 2,000 isolates with no treatment, or ineffective treatment, without getting one.
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The C.S.H. symposium was very fine -- lots of good discussions and some excellent papers -- especially Spiegelman's and Sonneborne's, and Hershey's.  Dave did a very creditable job too.  Sonneborne has just hind[?] v. Wagtendonk, but you probably already know that.
Dave and Miriam are getting well settled, but are having trouble finding a house for later this summer.  The situation is difficult -- except for veterans.  I was glad to hear your house in P.A. went to Art (who will appreciate it) and that you are located in Pasadena.  How are the rest of the gang making out?
With best regards to all
Yours
Ed
P.S. We recently turned up a N-mustard adinene-purple -- we'd like to know if its [sic] the same as the Stanford purple -- shall I send it on?