Humphry Clinker, a sprawling novel written in the form of a series of letters, paints such a vivid picture of life in eighteenth-century England that it is much quoted even now and almost certainly therefore has a lot to answer for. In one of its more colorful passages Smollett describes how milk was carried through the streets of London in open pails, into which plopped “spittle, snot and tobacco-quids from foot passengers, over-flowings from mud-carts, spatterings from coach-wheels, dirt and trash chucked into it by roguish boys for the joke’s-sake, the spewings of infants … and, finally,
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