Sentence:  At twilight in the summer there is never anybody to fear—man, woman, or cat—in the chambers and at that hour the mice come out. They do not eat parchment or foolscap or red tape, but they eat the luncheon <WSD>crumbs</WSD>. 
Meaning of the word marked with <WSD> tags:  A small piece which breaks off from baked food (such as cake, biscuit or bread).