In this paper the authors, after mentioning the various researches hitherto made on cloves and the substances therein discovered, describe the preparation of the new acid.

20 lb. of cloves are extracted by boiling water, and the decoctions, after being concentrated to six gallons, were acted on by nitric acid, first in the cold, afterwards with the aid of heat. The action is brisk, and irritating vapours are given off, which affect the eyes strongly.