"Roger gathered a handful of stones and began to throw them." What page is this quote on?

The full quote for this episode is:

'Roger gathered a handful of stones and began to throw them. Yet there was a space round Henry, perhaps six yards in diameter, into which he dare not throw. Here, invisible yet strong, was the taboo of the old life. Round the squatting child was the protection of parents and school and policemen and the law. Roger’s arm was conditioned by a civilization that knew nothing of him and was in ruins.'

As the first person to answer stated, it is in the first half of Chapter 4, 'Painted Faces and Long Hair'. I would imagine that it would also be useful to know what the significance of the quotation means. Roger is one of the lesser characters within the novel, a boy who is easily influenced by others and has clearly until this point been relatively well brought up. It is clear that he would like to bully the other boy if he were able but he has been 'conditioned by a civilization', that of Britain, where he grew up, to behave in a kind fashion towards other boys. However, even though there is a war raging and he is now far removed from his family as a result of the plane crash, his upbringing still has a residual effect upon him which is 'invisible yet strong' - his moral education has rendered him incapable at this point of exploiting the weakness of the younger Henry. 

The importance of this scene, however, remains in the fact that this scene occurs just before Jack paints his face and that of the other 'hunters' on the island, one of the telling signs of their descent into atavism (savagery) and the dissolving of the parental influence that had so far kept them broadly under control. It is telling that in a few chapters, savagery had so fully controlled the boys' actions that one cannot imagine Roger leaving the space between Henry and the stones and would, perhaps, have been more willing to throw the stones at him. Thus, the scene has been carefully constructed by Golding as a marker of the lingering influence of parental influence on the boys just at the point where we are given a good example of this influence waning.