203 arsenical poisoning once more undergo a full revision. We are quite aware that M. Orfila has himself shown, by repeated experiments, that the per-oxide of iron furnished by druggists, as well as that more comnmonly in use, is almost always contaminated with arsenic, and has succeeded in tracing its existence in iron pyrites; but we are desirous that these experiments should be extended; that, as arsenic is so extensively diffused, and must necessarily be so frequently found in combinationt

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... ith iron ores, some attempt shouild be made to ascertain the proportion in which it occurs in various medicinal and officinal agents. By researches thus instituted upon a sufficietntly comprehensive scale, we might hope to ascertain the maximum quantity in which it is likely to exist, and consequently the limits of error in any individual case.