Chapter 1 is called "The Sound of the Shell."  This refers to the conch shell which Piggy finds on the beach.  He gives the shell to Ralph and shows him how to blow it.  When Ralph blows the shell all of the other children assemble.  It is decided that during meetings that whoever holds the horn may talk.  The horn thus comes to symbolize power, but it also represents order and rules, without which there can be no civilization.  In a way, it is like a judge's gavel.  It in itself has no power, but it represents the power of the judge and his right to rule in the courtroom.  In the end, as the boys have become savages, the shell first becomes less effective and then is shattered, just as is Piggy.

Chapter 2 is called "Fire on the Mountain."  ...