how is the gluttony of jacks group apparent in chapter 9

Jack and the group have killed a pig and Golding places emphasis on the feast.

"Long before Ralph and Piggy came up with Jack’s lot, they could hear the party....They were laughing, singing, lying, squatting, or standing on the grass, holding food in their hands. But to judge by the greasy faces, the meat eating was almost done; and some held coconut shells in their hands and were drinking from them. Before the party had started a great log had been dragged into the center of the lawn and ..."

THe greed and grease from the feast is on the bodies of the boys. Their feast represents power, of Jack, and gluttony.