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Mr. Hatchett was, he says, at first inclined to consider the artificial tanning product as exactly similar to the natural vegetable principle called tannin; but as there appeared to be a considerable difference between them with respect to the effect of nitric acid (which acid produces the one while it destroys the other), he thought it necessary to make some experiments on the comparative effects of this acid on those substances which contain the largest proportions of tannin. He accordingly subjected the artificial product, sometimes alone, and sometimes mixed with other substances, to the action of nitric acid; and although Mr. Hatchett cannot, he says, assert that this substance is absolutely indestructible when repeatedly distilled with that acid, yet the results of his experiments showed that the destruction of it, by that means, would be a work of considerable time and difficulty.

Additional experiments and remarks on an artificial substance, which possesses the principal characteristic properties of tannin