“You’re eating again, I notice,” said Ron, watching Hermione adding liberal amounts of jam to her toast too.

“I’ve decided there are better ways of making a stand about elf rights,” said Hermione haughtily.

“Yeah . . . and you were hungry,” said Ron, grinning.

There was a sudden rustling noise above them, and a hundred owls came soaring through the open windows carrying the morning mail. Instinctively, Harry looked up, but there was no sign of white among the mass of brown and gray. The owls circled the tables, looking for the people to whom their letters and packages were addressed. A large tawny owl soared down to Neville Longbottom and deposited a parcel into his lap—Neville almost always forgot to pack something. On the other side of the Hall Draco Malfoy’s eagle owl had landed on his shoulder, carrying what looked like his usual supply of sweets and cakes from home. Trying to ignore the sinking feeling of disappointment in his stomach, Harry returned to his porridge. Was it possible that something had happened to Hedwig, and that Sirius hadn’t even got his letter?

His preoccupation lasted all the way across the sodden vegetable patch until they arrived in greenhouse three, but here he was distracted by Professor Sprout showing the class the ugliest plants Harry had ever seen. Indeed, they looked less like plants than thick, black, giant slugs, protruding vertically out of the soil. Each was squirming slightly and had a number of large, shiny swellings upon it, which appeared to be full of liquid.

“Bubotubers,” Professor Sprout told them briskly. “They need squeezing. You will collect the pus—”

“The what?” said Seamus Finnigan, sounding revolted.

“Pus, Finnigan, pus,” said Professor Sprout, “and it’s extremely valuable, so don’t waste it. You will collect the pus, I say, in these bottles. Wear your dragon-hide gloves; it can do funny things to the skin when undiluted, bubotuber pus.”

Squeezing the bubotubers was disgusting, but oddly satisfying. As each swelling was popped, a large amount of thick yellowish-green liquid burst forth, which smelled strongly of petrol. They caught it in the bottles as Professor Sprout had indicated, and by the end of the lesson had collected several pints.

“This’ll keep Madam Pomfrey happy,” said Professor Sprout, stoppering the last bottle with a cork. “An excellent remedy for the more stubborn forms of acne, bubotuber pus. Should stop students resorting to desperate measures to rid themselves of pimples.”

“Like poor Eloise Midgen,” said Hannah Abbott, a Hufflepuff, in a hushed voice. “She tried to curse hers off.”

“Silly girl,” said Professor Sprout, shaking her head. “But Madam Pomfrey fixed her nose back on in the end.”