In the name of German research on aviation medical problems, I beg to thank you very obediently for the great help and all the interest shown in the Dachau experiments; these experiments form a complement which is, for us, of great value and importance.
The fact that an atmosphere with so little oxygen can be endured at all for some time is most encouraging for further research.
It is true that no conclusions as to the practice of parachuting can be drawn for the time being, as a very important factor, namely cold, has so far not yet been taken into consideration; it places an extraordinary excess burden on the entire body and its vital movements, so that the results in actual practice will very likely prove to be far more unfavorable than in the present experiments.
In the meantime the supplementary tasks required now have been begun. In part they will have to be finished only after completion of the new Research Institute for Aviation Medicine of the Reich Air Ministry in Tempelhof, whose low-pressure chamber will include all cold generating apparatus and also an installation for producing conditions at a height of 30 kilometers.
Freezing experiments in another direction are, in, part, still being made at Dachau.
When the work will need once more your sympathetic assistance, may I be allowed to get in touch with you again through Stabsarzt Dr. Rascher?
Heil Hitler
[Signed] Prof. Dr. Hippke
TRANSLATION OF DOCUMENT NO-224
PROSECUTION EXHIBIT 76