Which character speaks to the Lord of the Flies?

In one of the most pivotal moments in the novel, Simon
encounters the Lord of the Flies.  What is originally portrayed as a pig's head on a
stick, the Lord of the Flies morphs into a dangerous and symbolic representation of evil
through Golding's sharp and vivid use of imagery.  In Chapter Eight, "Gift for the
Darkness," Jack leaves the beast a gift--the severed head of the sow he had just
decapitated--and it is this head that Simon meets in the
forest. 

The head seems to agree with his thoughts, "that
everything was a bad business" (136).  William Golding's use of dialogue and detail in
this scene suggests that Simon's conversation with the beast takes place entirely in
Simon's own mind.  The Lord of the Flies taunts Simon, and Simon fears "that one of his
times was coming on.  The Lord of the Flies was expanding like a balloon"
(143).

Simon's moment with the Lord of the
Flies is significant, because he confirms Simon's belief that the beast is
perhaps the boys themselves.