Before we go into a discussion on the falling experiments it seems essential for us to cite the work of Lutz and Wendt on “Animal Experiments on Parachute Jumping from High-Pressure Cabins.” Unfortunately this work was not available to us during these experiments so that we could not build upon the valuable results contained in it and derived from numerous animal experiments, or upon the experience of the authors. Although both authors approach with necessary scepticism the problem of “reaching decisions through animal experimentation upon questions in [page 24 of original] which, in the final analysis, the behavior of the human being in identical situations is of exclusive interest,” they could, and had to depend upon the previously proved experience that no fundamental qualitative differences in the manner of reaction to oxygen lack is to be expected between animals and human beings although there are considerable quantitative differences which, in this case, mean temporal differences. However, the results of our experiments show that to some extent quantitative as well as qualitative differences are present to the extent that the above animal experiments must lead to great fallacies which are significant to future developments. This appears especially in a comparison of results obtained with animals with the collective results of human experimentation upon escape from high altitudes through free fall without oxygen. On the basis of animal experiments, Lutz and Wendt were forced to the conclusion that if oxygen is breathed before the pressure drop “jumps from 14 km. [45,900 ft.] altitude can theoretically be survived—at any rate, that is the maximum altitude * * *,” whereas we were able to carry out human experiments up to 21 km. [68,900 ft.] altitude without any harm whatever. In all experiments at 20 km. [65,600 ft.] the subjects recovered clear consciousness with spontaneous control above 3 km. [9,800 ft.], and so within a sufficient altitude for actual parachute jumping. As instructed before the experiment, the subject rang a cowbell hung up in the chamber by pulling a handle (the equivalent of pulling the rip cord) without a new order to do so, so that under actual conditions they would certainly have also pulled the rip cord at the right time. Experiments with a pressure drop from 4 km. [13,100 ft.] without previous breathing in of oxygen were not carried out by us because we proceeded from the viewpoint that when contact with the enemy is possible, pressure cabin machines fly with a pressure corresponding to 8 km. [26,200 ft.] altitude and, therefore, the crews would already be breathing oxygen in case of a possible pressure drop as a result of damage to the cabin. [page 25 of original]