The Ding diary shows that, subsequent to this meeting, experiments were conducted at Buchenwald at the instigation of the defendant Rose. The entry under date of 8 March 1944, which refers to “typhus vaccine experimental series VIII”, appears as follows: “Suggested by Colonel M. C. of the Air Corps, Professor Rose (Oberstarzt), the vaccine ‘Kopenhagen’ (Ipsen-Murine-vaccine) produced from mouse liver by the National Serum Institute in Copenhagen was tested for its compatibility on humans. 20 persons were vaccinated for immunization by intramuscular injection * * *. 10 persons were contemplated for control and comparison. 4 of the 30 persons were eliminated before the start of the artificial injection because of intermittent sickness * * *. The remaining experimental persons were infected on 16 April 44 by subcutaneous injection of 1/20 cc. typhus sick fresh blood * * *. The following fell sick: 17 persons immunized: 9 medium, 8 seriously; 9 persons control: 2 medium, 7 seriously * * *. 2 June 44: The experimental series was concluded 13 June 44: Chart and case history completed and sent to Berlin. 6 deaths (3 Copenhagen) (3 control). Dr. Ding.” When on the witness stand Rose vigorously challenged the correctness of this entry in the Ding diary and flatly denied that he had sent a Copenhagen vaccine to Mrugowsky or Ding for use at Buchenwald. The prosecution met this challenge by offering in evidence a letter from Rose to Mrugowsky dated 2 December 1943, in which Rose stated that he had at his disposal a number of samples of a new murine virus typhus vaccine prepared from mice livers, which in animal experiments had been much more effective than the vaccine prepared from the lungs of mice. The letter continued: “To decide whether this first-rate murine vaccine should be used for protective vaccination of human beings against lice typhus, it would be desirable to know if this vaccine showed in your and Ding’s experimental arrangement at Buchenwald an effect similar to that of the classic virus vaccines. “Would you be able to have such an experimental series carried out? Unfortunately I could not reach you over the phone. Considering the slowness of postal communications I would be grateful for an answer by telephone * * *.” The letter shows on its face that it was forwarded by Mrugowsky to Ding, who noted its receipt by him 21 February 1944. On cross-examination, when Rose was confronted with the letter he admitted its authorship, and that he had asked that experiments be carried out by Mrugowsky and Ding at Buchenwald. The fact that Rose contributed actively and materially to the Mrugowsky-Ding experiments at Buchenwald clearly appears from the evidence. The evidence also shows that Rose actively collaborated in the typhus experiments carried out by Haagen at the Natzweiler concentration camp for the benefit of the Luftwaffe.