Then he showed Huckleberry how to make an H and an F, and the oath was complete.

They buried the shingle close to the wall, with some dismal ceremonies and incantations, and the fetters that bound their tongues were considered to be locked and the key thrown away.
A figure crept stealthily through a break in the other end of the ruined building, now, but they did not notice it.
"Tom," whispered Huckleberry, "does this keep us from EVER telling -- ALWAYS ?" "Of course it does.

It don't make any difference WHAT happens, we got to keep mum.

We'd drop down dead--don't YOU know that ?" "Yes, I reckon that's so." They continued to whisper for some little time.

Presently a dog set up a long, lugubrious howl just outside--within ten feet of them.