We haven't got any." Jessie looked nonplussed.

"May I have this ?" she asked at last, picking up a bit of rag from a pile of things untidily heaped on a chair.

Mrs.Lang, though, was gone, and did not hear her.
Jessie looked at the rag, and pondered.

At last, however, the temptation to wipe off some of the dust became too much for her, and she used it.

"I can wash out the rag again," she comforted herself by thinking.