《食人鱼》1“‘You see, monsieur, I am going to use them,’ I replied, and said

“Dragons!” she said, in a disgusted tone, pulling Harry inside. The tent was divided into cubicles; he could make out Cedric's shadow through the canvas, but Cedric didn't seem to be badly injured; he was sitting up, at least. Madam Pomfrey examined Harry's shoulder, talking furiously all the while. “Last year dementors, this year dragons, what are they going to bring into this school next? You're very lucky…this is quite shallow…it'll need cleaning before I heal it up, though….”

《食人鱼》1 

“Bathilda Bagshot?” Harry said. “The author of A History of Magic?”
“Dragon – dragon heartstring.”