John,
I checked the "catalogue général" of the "Bibliothèque Nationale de France" (The French National Library). I found no 2nd volume in it. If it's not there it is highly probable that it was never published.
I think that vol. 2 was never published because of the outbreak of WWI.
Dan.

Yes, that was my suspicion. The Bibliothèque Nationale catalogue would seem to confirm that. Thanks for checking that.