quick of apprehension

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This Lion or landlord,--for he was called both man and beast, by reason of his having instructed the artist who painted his sign, to convey into the features of the lordly brute whose effigy it bore, as near a counterpart of his own face as his skill could compass and devise,--was a gentleman almost as quick of apprehension, and of almost as subtle a wit, as the mighty John himself.