the soil of the burying-ground, or the air of the vaults where the bodies are deposited. Different soils and different conditions of the air will materially affect the decomposition of all bodies indiscriminately, and will therefore affect likewise the antiseptic properties of arsenic. For it would be absurd to ascribe to arsenic the power of preventing putrefaction in all circumstances whatsoever,—a power which those who make use of it for preserving skins know very well it does not possess, and a power possessed by no antiseptic whatever, not even by alcohol."[1]
An important consequence of the preservative tendency of arsenic is, that in many instances the body in this kind of poisoning may be found long after death in so perfect a state as to admit of an accurate medico-legal inspection and a successful chemical analysis. In one of his cases Dr. Bachmann detected arsenic in the stomach fourteen months after interment; Dr. Borges had no difficulty in detecting it in an animal after thirteen months; Mr. Herapath discovered it after fourteen months in the human body; M. Henry detected it after three years and a half, and obtained no less than seven grains of metallic arsenic from the shrivelled viscera;[2] and MM. Ozanam and Idt found it after the long interval of seven years.—The late experiments of Orfila and Lesueur confirm the fact that arsenic may remain long in contact with decaying animal matter, and yet continue in such a state as to be easily detected.[3] It might be supposed that the poison would pass off partly in the gaseous state by being converted into arseniuretted-hydrogen, partly in the liquid state by becoming arsenite of ammonia, a very soluble compound. But the fact nevertheless is, that, notwithstanding these reasons for its disappearance, it may be detected after the lapse of several years.
Under the head of the diseased appearances left by arsenic in the dead body, every change of structure has now been described which has been mentioned by authors and supported by trustworthy statements. Another set of appearances may still be noticed; but they are here separated from the rest, because the author who first notices them has not been supported in the statement by any special observations of his own, or by an adequate number of facts observed by others. In an elaborate essay on a case of poisoning by Professor Seiler of Wittemberg, it is said in general terms that arsenic may cause gorging of the vessels of the brain, effusion of serum into the ventricles, inflammation of the brain, and even extravasation of blood.[4] Turgescence of vessels is mentioned in several published cases, and I have myself met with it. But it is seldom so considerable as to attract attention. In the following instance, however, which has been related by Dr. Hofer of Biberach the evidence of cerebral congestion was unequivocal. A man addicted to intoxication, but enjoying good health otherwise, was attacked after supper with
