What pages was Ron Weasley in the hospital wing in Harry Potter and the Half-Blood Prince?

In "Harry Potter and the Half-Blood Prince," Ron Weasley is in the hospital wing after being poisoned by a drink intended for Harry. This incident occurs during the Quidditch match against Slytherin, and he spends time recovering there. Specifically, he is mentioned in the hospital wing around chapters 14 and 15, as Harry visits him to ensure he is okay and to discuss other events happening at Hogwarts.