Oct 31, 1959 Dear Professor Joshua Lederberg: It is very kind of you to have sent me a letter in answer of my asking UF[?] sintered glass filter disk. I am sorry not to have answered you sooner because I have been to Kyushu district for our major Congress. The other day, I demanded to send the Corning Company A pamphlet explaining about the filter, and I shall get it. Next year, I shall go to Cornell University and discuss about my data with Dr. M. Alexander. Finally, hoping that you will excuse my troubling you to whom I am so much indebted. Sincerely yours, Michiham Kobayashi