How does Golding establish Jack, Ralph and Simon as separate characters in chapter 3?

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How does Golding establish Jack, Ralph and Simon as separate characters in chapter 3?

Chapter 3, while being comparatively short, is extremely significant in character development in the book. The chapter serves almost as a triptych as Golding examines the individual components of each of the initial three characters: Jack, Ralph and Simon.

Sigmund Freud's model of the human psyche - the id, the ego and the superego - can be applied to the three characters. Jack, the 'id', only thinks about satisfying his appetite, much like a primitive animal. Ralph, the 'ego', follows much more rational thinking and makes sensible decisions and performs practical actions. Simon on some levels fits the 'superego' as he operates on a higher level of consciousness and is very spiritual and religious.

At the start of the chapter, Jack is alone in the jungle, hunting for meat like an animal. "Dog-like...on all fours", Jack is no longer a civilised human being but has turned into a savage animal, stalking his prey. He has become so obsessed with 'meat' that it he has become crazy, his eyes "bolting...nearly mad" as he desperately tracks down the pig. Golding directly mentions Jack's atavistic characteristics,