They may have considered that the beating of their hearts was noisy enough.

But people in this world are slow at hearing other people's hearts beat.

No one seemed to notice it.
It is due to the stouter of these two young gentlemen to say that the beating of his heart, and the general state of amaze in which he found himself, did not interfere greatly with his appetite.

He had brought that accomplishment, if no other, from home, and not being engaged like those around him in conversation, he contrived to put away really a most respectable meal.

Indeed, his exploits in this direction had already become a matter for remark among his neighbours.
"It's all right," said one of the juniors, who answered to the name of D'Arcy; "his buttons are sewn on with wire.