No work is being done in the Temples at present neither has any been done in the past for the negro saints. Priesthood cannot be given to a negro and this rule apears to hold good regarding other ordinances of the Temple.
... [it is] the obligation resting upon the elders to carry the gospel to the white race and perform ordinances for the ancestors of the white race. If a negro has faith in the Gospel, repents of his sins and applies ... for baptism, he cannot be denied this precious blessing. ... [The] progeny of a white man who mingles his seed with that of a negro, are to be regarded as negroes.
[Rudger Clawson, Letter to Brigham A. Hendricks, October 25, 1910, as quoted in Minutes of the Apostles of The Church of Jesus Christ of Latter-day Saints, 1910-1951, Privately Published, Salt Lake City, Utah 2010]