When Ralph first spots the conch in the lagoon Piggy tells him, "I knew a boy who had one of those, on his garden wal it was, they are ever so valuable." He later tells Ralph that the boy, "he used to blow it to make a noise," and explains to Ralph that the boy blew from his diaphragm in order to get a noise from the conch shell. So although Ralph actually finds, recovers and blows the conch. Piggy identifies it correctly and informs Ralph that it can be blown.
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When Ralph initially spots the conch shell in the lagoon it is Piggy who tells him that he knew a boy who had a conch shell in his garden and that the boy used to blow into it and that it made a loud noise. He then explains to Ralph exactly how the boy blew into the conch shell.
Piggy is deeply afraid of Jack, of Jack's superior strength, aggression and tendency towards anger and violence. By constantly reminding Jack of the conch he hopes it will act as a restraint on Jack. All the boys know that the conch symbolises rules, law and order and Piggy knows that without these he would be at the mercy of Jack.
Piggy attempts to protect the conch because he is attached to society. All of the other boys on the island have let go of society but Piggy remains attached to society. The conch is the symbol of society so Piggy attempts to protect it.
it is his "claim to fame" as he found it, and this is the first time i the novel we see how knowledgeable he is. It is also a symbol for peace which he desperately hold on to, even as he dies. the conch shell was used to call all the boys together. In this respect, it is a symol of unity. It was laso held by the person speaking, which was a rule. This makes it a symbol of order and reasonable thinking. When it is destroyed it symbolises the loss of all sensible thinking and the start of total anarchy which is what Piggy feared the most
the Conch is destroyed along with Piggy Page 181 " The rock struck Piggy a glancing blow from chin to knee; the conch exploding into a thousand white fragments and ceased to exist." Piggy is holding it up for order, and then Rodger leans all his weight onto the lever, than causes a bolder to fall; killing Piggy, the symbol for the adult world, and destroying the conch, the symbol for civilization. Jack then states that since there is no conch, then their tribes doesn't exist, he then proceeds to declare himself chief and tries to kill Ralph with his spear.
In chapter nine: A View To A Death, when Ralph and Piggy attend Jack's feast Ralph says that he is still the chief and he has the conch. "You haven't got it with you," said Jack sneering. "You left it behind. See, clever? And the conch doesn't count at this end of the island ---"
When Roger launched the boulder from the top of Castle Rock "with a sense of delirious abandonement," it struck Piggy a "glancing blow" and the conch "exploded into a thousand white fragments and ceased to exist." Piggy then travelled sideways through the air and fell forty feet to land on his back on the square rock in the sea. "His head opened and stuff came out and turned red."
Well in chapter 10 Jack and his tribe of savages invade Ralph's tribe (made of up Ralph, Sam and Eric, Piggy, and one/two littluns) in order to steal Piggy's glasses, which is overall the power to start a fire on the island. Jack might have mentioned this plan in chapter 9 so I'm hoping this is the right answer to your question.