July 26, 1947. Year Dr, NeClintock— In a the course of a review, I am going to have occasion to refer to the possibility that Lindegren's yeass (mis—)behavior can be accounted for on the basis of polysomic inheritance. I understand that you were Perhaps the first to raise this question, I should like to refer to you ag the source of this suggestion. “ould this meet with your approval? The reference would read simply somewhat as follows; " As Dr. McClintock has pointed out, the occurrence of anemlaus tetrads might be the remit of polysomic or polyploid inheritance. At least, this has not been tuled outs..." fhe paper is rather speculative, and I would prefer to avoid the impression that I am coining these ideas rather than collecting them. Yours sincefely,. t ‘Joshua Lederbe rg.