This necessity does not cease to exist because the people concerned realized that with this first series of experiments, carried out in Dachau in the spring of 1942, the problem in question (rescue from high altitudes) was not yet entirely solved. Ruff and Romberg pointed out in their final report of 28 July 1942, that the “danger of freezing has to be considered.” On the basis of this final report the medical inspector, Dr. Hippke, later pointed out in his letter to Himmler of 10 October 1942 (_NO-289, Pros. Ex. 72_) that in the Dachau high-altitude experiments of Ruff and Romberg of spring 1942, “a very important factor was not yet taken into consideration, namely freezing.” He remarked, however, at the same time that “the necessary supplementary work was started meanwhile.” Hippke did not leave any doubt that this fact would not impair the value and the importance of the Dachau high-altitude experiments, which he stressed; for it is in the nature of such experiments that both parts of the problem, high altitude and freezing temperatures, cannot be dealt with simultaneously, but that at first only one part must be considered, then the other. This was Ruff’s plan from the very beginning, and the special experiments with regard to the influence of freezing temperatures on descent from high altitudes were carried out according to plan in the Berlin institute of Dr. Ruff in the summer and fall of 1942. (Compare this with Dr. Grauer’s affidavit of 28 January 1947.) Another prerequisite for the justification of the high-altitude experiments undertaken by Ruff and Romberg lies in the requirement that the experiments should not be extended any further than is necessary for the solution of the problems presented. This requirement, too, was fulfilled by Dr. Ruff. It is confirmed by his own testimony (_German Tr. p. 6704_), as well as by the testimony of Dr. Romberg (_German Tr. pp. 6879-80_), that Dr. Romberg was sent by Dr. Ruff to Dachau with a definite program which carefully outlined the kind as well as the extent of the experiments to be carried out. Only the problem of “rescue from high altitude” was to be investigated. Only experiments for this purpose were ordered by Dr. Ruff. Dr. Romberg was not allowed to undertake experiments for any other purposes, and the experiments were to be carried on only until either the problem was solved or its solution found impossible. Had Dr. Romberg not adhered to this program, which had been strictly outlined, had he carried out further experiments behind Dr. Ruff’s back, the latter could in no case have been responsible for them. Since he was not told of such further experiments by Dr. Romberg, he could not stop them. However, it must be stated expressly that Dr. Romberg adhered to Dr. Ruff’s orders; he did not carry out more extensive experiments than he had been permitted and had been ordered; this was done alone and solely by Dr. Rascher. The latter, however, was in no way subordinated to Dr.