The girls entered by the rear door.
"Mercy!" exclaimed the guardian.

"How warm it is in here.

Mr.Dickinson, is there any glass in those windows ?" Dickinson shook his head.
"Then please knock out the boards." Harriet already was doing this.

She succeeded in ripping off a few planks, letting in the fresh air and sunlight.

What they saw then did not please them.