Minutes of the Council of the Twelve and of the First Presidency: Letter read from Elder John A. Widstoe calling attention to the engagement of a young couple, members of the Church, the sister having one thirty-second of negro blood in her veins. Brother Widstoe raises the question as to whether in such cases the individual having Negro blood might be recommended to the temple for marriage. Brother Widstoe states that he informed the couple of the ruling of the Church in the past that any one having negro blood in his veins cannot receive the Priesthood or go to the temple. Council approved the attitude indicated by Brother Widstoe.
[Source: Adam S. Bennion Papers; Marquardt, H. Michael, Mormon Central: Excerpts From Minutes of the Council of the Twelve and of the First Presidency, 1879-1947 http://www.xmission.com/~research/central/chorg2.htm]