The news of the high efficiency of recombination in special cases is most exciting, and I've taken the liberty of passing
it on to Van Niel and others here. I'm not sure I know exactly what is meant by "nearly 100 percent", but it
sounds like a big step.
You are correct in concluding that we get fewer recombinants on plates than you, rather than more in the tubes. Yet, before
you dismiss from your mind the possible significance of the findings, I'd like to add that the reason is not that our
agar is too clean (i.e. with respect to the gr. reg. of these strains.) For we got identical results in agar slightly enriched
with the requirements of the recombinig strains. I didn't mention this earlier because it didn't seem to show anything
interesting - that is, we originally set up the expt. to see whether traces of gr. factors would promote the appearance of
recombinant prototrophs[?], as they do with U-V induced reversions prototrophs[?]. They didn't, probably because the mutual
syntrophism of the two strains, in their enormous[?]
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inocula[?]; outweighed any effect of added traces.
I hope you enjoy Gordon Allen's visit, and will not let it keep you back from getting off soon to a cooler spot. I've
urged him to stay on as long as you'll have him - but it's only fair to balance this pressure by urging you to feel
no obligation to stay. It's so cool here that I feel like stinker every time I write East.
The Novicks are here this month, and Ginny just came down for the weekend; Luria may be coming there soon. I'm so enjoying
the effortless pleasure of
learning from Van Niel that I've postponed visiting Pasadena until the trip back East, early in Sept.
I hope you and Esther get a comfortable vacation. My regards to Gordon.