On Oct. 17, 1943, a five year old, black and white spotted horse entered the Stange Memorial Clinic. The owner had previously written the clinic concerning the patient, giving a history which suggested nymphomania. The patient was observed for several days, but no symptoms of true nymphomania were exhibited. Instead, the horse showed symptoms of sexual desire resembling a stallion. Rectal palpation revealed rudimentary development of the uterus and vagina, the anterior poles of the uterine cornuae being terminated in pendant, cord-like structures of such length that the ovaries could not be palpated. A tentative diagnosis of gynandromorphia was made. After consulting the owner, it was decided to submit the horse to surgery.