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 infer that sugar was an antidote, and in the first editions of his Toxicology Professor Orfila agreed with him, and related some experiments of his own, which, along with those of Duval, seemed to place the fact beyond all doubt. Later and more careful experiments, however, satisfied Orfila, that it only acts as an emollient after the poison has been removed from the stomach, and that it has no effect at all if the poison is retained by a ligature in the gullet. Sugar being thus rejected as well as the sulphurets, he was led to try the effects of albumen; and his experiments induced him to recommend that substance as an antidote in preference to every thing else. He found that the white of six eggs completely neutralized the activity of between 25 and 36 grains of verdigris; so that even when the mixture was retained in the stomach by a ligature on the gullet no effect ensued which could be ascribed to the poison. He infers that white of egg is the best antidote for poisoning with copper. He likewise found the ferrocyanate of potass not inferior.

Since the publication of these inquires the subject has been again examined by M. Postel, who reverts to the original proposition of Duval, that sugar is really a good antidote; and he rests this conclusion partly on direct comparative experiments, showing that it is at least equally effective with white of egg, and partly on the singular fact as certained by him, that sugar, which was believed to decompose the salts of copper only at the temperature of 212°, does actually accomplish this decomposition at the temperature of the human body, and throws down the copper in the form of oxide.

According to the experiments of MM. Milne-Edwards and Dumas, metallic iron is likewise a good antidote: they found that when fifteen, twenty, and even fifty grains of sulphate of copper, acetate of copper, or verdigris, were given to animals, and an ounce of iron filings administered either immediately before, or immediately afterwards,—the gullet being tied to prevent the discharge of the poison,—death did not ensue for five, six, or even eight days, and consequently proceeded from the operation on the gullet; and that in one experiment, on the ligature being removed from the gullet, the opening healed up, and complete recovery took place.

Before quitting the subject of the treatment, it is necessary to caution the practitioner particularly against the employment of vinegar,—a substance often ignorantly used for this, in common with many other, species of poisoning. On account of its solvent power over the insoluble compounds formed by the salts of copper with animal and vegetable matters, it must be injurious rather than useful.