LUFTPOST PAR VION STATENS SERUMINSTITUT DIRECTOR: J. ORSKOV, M.D. COPENHAGEN S. — DENMARK TELEGRAMS: STATSSERUM, COPENHAGEN TELEPHONE: ASTA 2817 June 21°", 4958. Prof. Joshua Lederberg Dept. of Genetics University of Wisc. Madison 6, Wisconsin U.SeA. Dear Josh, Having just seen Furness’ paper in last issue of J. Gen. Mi- crobiol. on recombination experiments with Ki2 and coli B involving the H-antigen of the K12 strain, we wondered if we should not dare ask you how our little joined paper is for the moment. We are becoming more and more afraid that you have come to the conclusion that it is not worth publishing at all. We beg you not to misunderstand these words, we know very, very well that you sre extremely busy and that you have a lot of more in- portant things to do, but as you will know everybody is most interested in there own children even if they are newborn and not too pretty. Yours | (i. _ when yn 6 PS. In Furness’ paper he is stating that in crosses of the motile K12 and the immotile coli B-strain he will only get motile recombinants with the K12 H-antigen and never some with the "original" H-antigen of the coli B-strain.