Q. When was the first time that you witnessed one of these procedures?
A. The first time was on the occasion of an experiment with four such patients. I think it must have been December 1939 or January 1940. I know there was snow on the ground at the time. That is why I remember these months. Bouhler, Conti, and I don’t know who else was there, there were a few other doctors witnessing it for the first time. On the basis of this experiment Hitler decided that only carbon monoxide was to be used for killing the patients.
Q. Well now, before or after that time had you tried any other gases or any other means of administering euthanasia to these people?
A. No, we—and by this I mean Bouhler’s organization—never used any other gas or any other means.
Q. You found the carbon monoxide quite satisfactory, so you never had to resort to any other means?
A. Yes. You can put it that way.
Q. Now, where was it that these four people were accorded the privilege of a mercy death in December, 1939 or 1940?
A. That was in the first euthanasia station in Brandenburg.
Q. And who were the subjects that were used for that experiment?
A. They were four mentally incurable persons.