The three cases of this anomaly reported by the author, were met with in a population of about 2700 persons. In two of the cases, both hands and feet presented six digits; in the third case the condition existed in the feet only. An exhaustive examination of the family history of the cases through three generations failed to disclose any hereditary tendency to polydactylism or any degenerative taint. In only one of the cases were the parents of kin second cousins. One of the subjects was above the average in intelligence, the other two were somewhat weak-minded.