Investigations were carried out on dogs in order to study the changes in the prostatic gland after embolization of the internal iliac arteries. The experiments showed that slight fine-celled infiltrations occurred in the interstitial tissue as a result of ischaemia of that organ. The authors are of the opinion that embolization of the internal iliac arteries may be used in clinical practice as a method of treating haemorrhages from the prostatic gland.