H. H. [Handwritten initials]
Top Secret
| [Handwritten]: | 1 read |
| 2+ | |
| 5 May 41 |
Dear Reich Leader:
Enclosed herewith for your information is the result of the investigations into the possibility of sterilization or castration, respectively, by means of X-rays. I request your instructions as to what further theoretical or practical steps, if any, are to be taken in this matter.
Heil Hitler!
[Signed] Brack
Enclosure
The experiments in this field are concluded. The following result can be considered as established and adequately based on scientific research:
If any persons are to be sterilized permanently, this result can only be attained by applying X-rays in a dosage high enough to produce castration with all its consequences, since high X-ray dosages destroy the internal secretion of the ovary, or of the testicles, respectively. Lower dosages would only temporarily paralyze the procreative capacity. The consequences in question are for example the disappearance of menstruation, climacteric phenomena, changes in capillary growth, modification of metabolism, etc. In any case, attention must be drawn to these disadvantages.