In the present context, the term bookworm refers to the larvae of certain wood-boring beetles which feed on paper (p. 122).
These larvae require a high humidity and nowadays they rarely attack books. They only occur in books which stand undisturbed for years in cellars or lofts.
Beetles and other insects with wood-boring larvae may, when they make their way out of timber, gnaw holes in paper that is nearby, as for example wallpaper.
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