Technically, we sort of still do unofficially use them. Have you ever bought a fifth of your preferred alcoholic beverage and wondered what it's a fifth of? 1/5 of a gallon, 4/5 of a quart, 757 milliliters, although it's now standardized at 750 ml, at various points called a short quart or commercial quart. Similarly with pints, a short pint being 4/5 of a pint. These are what Grant was referring to. Standardization was the reason for the changes in size and nomenclature. For as long as people have been bottling and selling alcohol, they put it into whatever bottles they wanted and sold it as they saw fit. In the US, the government started to take issue with this, especially with that short quart business, in the 1960s. To be clear, it was legal to sell 4/5 of a quart bottles, but calling it a quart was deemed too confusing. This led to new regulations in bottle sizes, proposed by the ATF and codified into law taking effect in 1980.