What did Harry learn by reading the page that was in Herimones fist?

Answer 1

He learned that the creature petrifying students was a basilisk, and that it was traveling through the Plumbing. It was a page that Hermione had ripped out of a book about basilisks.

Answer 2

He learned about the basilisk and that it was travelling through the school using the plumbing which gave him the idea of Moaning Myrtle's bathroom.

Answer 3

That the monster was a basilisk.

Answer 4

He learned that Tom had once got a metal for finding the so called Slytherin heir.

Answer 5

He learned that the rooster crows are fatal to the Basilisk.