Note 1522 — BOOK XIV. THE NATURAL HISTORY OF THE FRUIT TREES.

We have already stated that “vappa” is properly vinegar, which has been exposed to the air and has lost its flavour. In this fresh chemical change, which he calls a second fermentation, the wine becomes vinegar; and probably in the cases he mentions, for some peculiar reason, its speedy transition to “vappa” could not be arrested.