“The experiments which are to be performed on prisoners are to be carried out in four rooms of an already existing medical barrack. Only slight changes in the construction of the building are required, in particular the installation of the hood which can be produced with very little material. In accordance with attached plan of the construction management at Natzweiler, I request that necessary orders be issued to same to carry out the reconstruction. All the expenses arising out of our activity at Natzweiler will be covered by this office.” In a memorandum of 3 November 1942 to the defendant Rudolf Brandt, Sievers complained about certain difficulties which had arisen in Natzweiler because of the lack of cooperation from the camp officials. He seemed particularly outraged by the fact that the camp officials were asking that the experimental prisoners be paid for. A portion of the memorandum follows: “When I think of our military research work conducted at the concentration camp Dachau, I must praise and call special attention to the generous and understanding way in which our work was furthered there and to the cooperation we were given. Payment of prisoners was never discussed. It seems as if at Natzweiler they are trying to make as much money as possible out of this matter. We are not conducting these experiments, as a matter of fact, for the sake of some fixed scientific idea, but to be of practical help to the armed forces and beyond that, to the German people in a possible emergency.” Brandt was requested to give his help in a comradely fashion in setting up the necessary conditions at Natzweiler. The defendant Rudolf Brandt replied to this memorandum on 3 December 1942 and told Sievers that he had had occasion to speak to Pohl concerning these difficulties, and that they would be remedied. The testimony of the witness Holl was that approximately 220 inmates of Russian, Polish, Czech, and German nationality were experimented upon by Hirt and his collaborators, and that approximately 50 died. None of the experimental subjects volunteered. During the entire period of these experiments, Hirt was associated with the Ahnenerbe Society.