Question: A peck is an imperial and United States customary unit of dry volume, equivalent to 2 gallons or 8 dry quarts or 16 dry pints, despite being referenced in which well-known English-language nursery rhyme and well-known alliteration tongue-twister?
Sentence (from "Bushel"): In modern usage, the volume is nominal, with bushels denoting a mass defined for each commodity differently.
Relevant evidence: No