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GALLON, measures. A gallon is a liquid measure, containing two hundred and thirty-one cubic inches, or four quarts.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in classic literature ?
Gallon puffed at his cigar, and at the conclusion of the panegyric regarded the other curiously; but Daylight, ordering cocktails, failed to note this curious stare.
"Going in with him on some deal, I suppose," Gallon remarked.
We had but half a pint a head, and each of us could have drunk a gallon.
"Or," I continued, "the size of the Nautilus being 1,500 tons; and one ton holding 200 gallons, it contains 300,000 gallons of air, which, divided by 480, gives a quotient of 625.
Besides a sufficient stock of pure brandy, he arranged two water-tanks, each of which contained twenty-two gallons.
'I'll drink it all up at a gulp, see if I don't.' And sure enough, when the forty casks of wine containing forty gallons each were brought alongside of the ship, they disappeared down the thirsty comrade's throat in no time; and when they were empty he remarked:
Their horns are so large, the inhabitants use them for pitchers, and each will hold about five gallons. One of these oxen, fat and ready to be killed, may be bought at most for two crowns.
a sulk and pout, by carpenter's measurement, about twenty feet long and five feet deep; a sulk and pout that will yield you some 500 gallons of oil and more.
Stop this moment, I tell you!' But she went on all the same, shedding gallons of tears, until there was a large pool all round her, about four inches deep and reaching half down the hall.
These were filled with water from the stream, and each of them might hold from four to five gallons.
Similarly, 8 million gallon water got from the tube wells installed at Rakh Branch Canal while 3 million gallon water was produced by the tube wells working at Jhal Water Works and 1.5 million gallons water by the tube wells of Millat Town Water Works.