UNIVERSITY OF KENTUCKY LEXINGTON COLLEGE OF ARTS AND SCIENCES DEPARTMENT OF BACTERIOLOGY lith January, 1953 ur. J. Lederberg ve.artment of Genetics University of Wisconsin Madison, Wisconsin Dear Dr. Lederberg: This note is to express my appreciation for the cultures and directions which you sent for the aemonstration of recombination in bacteria. We expect to try this demons:ration soon and I am certain that some of our students will learn a great deal from it. Yours sincerely, R. H. Weaver, trofessor of Bacteriology. BHW/GA