[Rune Son of Bjarne]

I don't think that the Ring had a great enough power over Bilbo to make him respond to the summons. . .at least not in a way that would make him journey to Mordor!

I think that you a quite right Radagastly, when you say that the restlessness of Bilbo is caused by the ring. I do however believe that he was still to much in control of him self, to wander of from Rivendell all the way to Mordor.