Weltz testified that a meeting took place in the summer of 1941 on the occasion of a visit by Generaloberstabsarzt Hippke to Luftgau VII. (_Tr. p. 7056._) In a discussion between Weltz, Kottenhoff, and Hippke, Hippke gave his approval in principle to the experiments if they were deemed necessary. (_Tr. p. 7065._) In the course of the summer of 1941, Rascher went to Weltz and proposed the slow-ascent experiments, but Weltz turned them down as unnecessary. (_Tr. p. 7176._) This testimony of the defendant Weltz clearly indicates the jurisdiction Weltz had over Rascher’s activities. This refusal to permit the performance of slow-ascent experiments bears out the contention of the prosecution that the defendant Weltz had the power and the authority to intervene at any time. Weltz’ actions throughout the entire development of the plans for the experiments were not merely negative. He was in full accord with the entire enterprise and he realized that Rascher did not possess the necessary qualifications to conduct these experiments without the assistance of a specialist in this particular field of aviation medicine. Furthermore, although Rascher was attached to Weltz’ Institute he had no other definite work. (_Tr. pp. 7078 and 7187._) To find a specialist to collaborate with Weltz and Rascher proved to be a difficult task. Weltz first approached members of his own institute, namely Lutz and Wendt, men of considerable reputation in this field, but to no avail. Wolfgang Lutz appeared before this Tribunal and testified that Weltz requested his assistance, as well as the assistance of Wendt, but that they both refused on moral grounds. (_Tr. p. 269._) Weltz did not deny this, but contended that his questions to Lutz were purely rhetorical. (_Tr. p. 7069._) The inability to interest a specialist in the field of high-altitude research to collaborate with Rascher explains the cause for the lapse of time between the date of the authorization by Himmler and the actual date of the commencement of the experiments, viz, July 1941 to February 1942. Weltz was not a specialist in high-altitude research. Kottenhoff was transferred to Romania, and Rascher was comparatively a novice in this field.