. . . th agape Dr.W.Hdeumann Braunschweig, Jane24"" 1956 Botanisches Institut Humboldtstrasse 1 Technische koachschule Professor Dr.Joshua Lederberg University of Wisconsin College of Agriculture Department of Genetics Madison 6 / Wisc.-U.S.A. Dear Professor Lederberg, I thank you very much.for your letter of the 7 inst. and for the cultures W-6 ap W-1177 you sent me. I shall 4a test these strains with my’ own methods to find out if: ‘y morpholpgic-cytological signs of a sexual process are ‘to ‘ be notised in mixed cultures. . hin the meantime FE have realized hat the subcultures of my bacterial strain Bg= Are contaminated. Therefore I ask. yous to leave BB. out and to test only the sérains Ba, BE ‘and Hyd - ~ as : i beg to thank you alse for your’ “propodal sto bring me inta9 touch with Professor WILSON, thus enabking. me to re- & sume ‘my investigations on nitrogen fixation BY Thizobia in yitro Whilst staying in your laboratorys The: problem of nitrogen fixation is highly interesting, though extraor- dinary difficult. I. had to; interrupt’ my investigations as it was ‘impogsible to manage without any assistance. “My application for a scholarship at your’ Jaboratory has’ been sent in to the Deutsche..Forschungsgemeinschaft - (address: Bad Godesberg beBoni sy -Re hkengraben. 46). Yot, would greatly oblige me by supporting this applications It would be advisable to state:am Your letder:1. that you. think it essential to test, my -Borpnologic- ‘eytolo:ical; < statements on the sexual Proce star-forming pacterta =: by your genetic methods, . 2. tha’ upee investigations will take one year's time, and 3.tha Gvsalary is paid there. As soon as I shall have learnt,if the scholarsnip has been granted and to what amgunt, rE shall apply as well to™ the United States Educational Commission in the Federal Republic of Germany (Fulbright Commission) and -if necessa- lyr also to the Rockefeller Foundation. Thanking you in advance for your help, I am, very sincerely yours,