Describes experiments on vaccines and medicaments carried out in the Buchenwald concentration camp for the pharmaceutical branch of IG-Farben. Brings excerpts from correspondence between IG-Farben and camp authorities showing that the company was aware on whom and under what conditions the experiments were done. In the IG-Farben trial of 1946, the American military court accepted the defendants' plea of ignorance and some were freed while others were sentenced to short terms in prison, a fact cited by the firm in defending itself against recent exposures of its activities during the Nazi period.