FYI, the earliest source seems to be The Nation, Vol XIX, No 484, 8 Oct 1874, p 234, col 1 [http://bit.ly/2sXXEsx]. Also, the 19 Nov 1874 issue, p 331, col 2, notes that the publication of this sonnet in October contained a typographical error, i.e., that “court” should have been “count”.