Harry’d lived with the Dursleys almost ten years, ten miserable years, as long as he could remember, ever since he’d been a baby and his parents had died in that car crash. He couldn’t remember being in the car when his parents had died.

(...)

At school, Harry had no one. Everybody knew that Dudley’s gang hated that odd Harry Potterin his baggy old clothes and broken glasses, and nobody liked to disagree with Dudley’s gang.

(...)

Harry was glad school was over, but there was no escaping Dudley’s gang, who visited the house every single day. Piers, Dennis, Malcolm, and Gordon were all big and stupid, but as Dudley was the biggest and stupidest of the lot, he was the leader. The rest of them were all quite happy to join in Dudley’s favorite sport: Harry Hunting.

This was why Harry spent as much time as possible out of the house, wandering around and thinking about the end of the holidays, where he could see a tiny ray of hope. When September came he would be going off to secondary school and, for the first time in his life, he wouldn’t be with Dudley. Dudley had been accepted at Uncle Vernon’s old private school, Smeltings. Piers Polkiss was going there too. Harry, on the other hand, was going to Stonewall High (1), the local public school. Dudley thought this was very funny.

"They stuff people’s heads down the toilet the first day at Stonewall," he told Harry. "Want to come upstairs and practice?"

"No, thanks," said Harry. "The poor toilet’s never had anything as horrible as your head down it - it might be sick." Then he ran, before Dudley could work out what he’d said.

(...)

That evening, Dudley paraded around the living room for the family in his brand-new uniform.

(...)

As he looked at Dudley in his new knickerbockers, Uncle Vernon said gruffly that it was the proudest moment of his life. Aunt Petunia burst into tears and said she couldn’t believe it was her Ickle Dudleykins, he looked so handsome and grown-up. Harry didn’t trust himself to speak.

He thought two of his ribs might already have cracked from trying not to laugh.

There was a horrible smell in the kitchen the next morning when Harry went in for breakfast. It seemed to be coming from a large metal tub in the sink. He went to have a look. The tub was full of what looked like dirty rags swimming in gray water.

"What’s this?" he asked Aunt Petunia.

"Your new school uniform," she said.

Harry looked in the bowl again.

"Oh," he said, "I didn’t realize it had to be so wet."

"I’m dyeing some of Dudley’s old things gray for you. It’ll look just like everyone else’s when I’ve finished."

Harry seriously doubted this, but thought it best not to argue. He sat down at the table and tried not to think about how he was going to look on his first day at Stonewall High - like he was wearing bits of old elephant skin, probably.

(J. K. ROWLING. Harry Potter and the Sorcerers Stone. New York: Arthur A. Levine Books, 1997.)

Harry, on the other hand, was going to Stonewall High, (1)

Aponte o valor semântico da expressão destacada. Apresente, também, as duas características de cada escola mencionada no quarto parágrafo.