Gallize

[page 163] Therefore it is, that to us the knowledge of how to properly gallize our wines is still more important than to the European vintner, and the results which we can realize are yet more important. [...] [page 172] Truth and justice need never fear the light—they can only gain additional force from it. I do not even attempt to sell a cask of gallized wine, before the purchaser is made fully acquainted with the fact, that it has been gallized.

Source: wiktionary

The demand for native wines has diminished of late considerably, and their sale rendered difficult; and, although other causes may, in part, account for this, one of them, not to be overlooked, will be found in the prejudice which has been created against them by the public discussion of the propriety of gallizing our wine, and which has furnished a weapon to the hands of the importers of foreign wines, which they have wielded and still wield with great effect against the use of our native produce.

Source: wiktionary

As a wine grape its unequaled bouquet is the principal recommendation. It is deficient in sugar, and the juice is usually gallized, fortified by the addition of alcohol, or otherwise manipulated.

Source: wiktionary

At the South Carolina State Fair, held at Columbia, wines were exhibited from other grapes made by the same process, with this difference—that some of them were not Gallized, and no sugar added.

Source: wiktionary