Richie
I think we have here exactly the same error as noted previously.

If we take into account that the first J was printed in the appendix to Part 2 and that the second J was printed in the appendix to Part 6 I think we can excuse this error. Part 2 was published in June 1884 and Part 6 in July 1889. 5 years is a long time in this business.

I only have the 5 Dover volumes. It would be interesting to know what the Loomis Edition did about this.