Why does Ralph call the meeting in Chapter 5 of Lord of the Flies?

In the novel 'Lord of the Flies' by William Golding, the boys are not sticking to the plan to get themselves rescued from the island where they have been cast away as we move forward from chapter 3 towards chapter five. At first, once they have enjoyed the freedom, warm seas and soft sand, the novelty wears off and the older boys begin to address the problem of getting rescued. The first meeting shows promise and optimism. Responsible topics are discussed (such aas the need for shelter, food and a lookout) and plans suggested for how to achieve all this. Soon however, Ralph notices things beginning to slide - and the motion is all downwards. Jack notices it too, and starts to complain about it - how the littluns are running off to play after getting bored five minutes after turning up to build the shelters. However, Jack himself has gotten distracted - by a drive to kill (supposedly for meat.) Ralph hopes another meeting will bring things back to order.