It was recognized that the qualities, physical, moral, and mental, possessed by a truly able and upright Juge d'Instruction were necessarily exceptional. He should have a very extensive judicial knowledge and experience, he should be gifted with powers of precision, of observation, of decision, of activity, of patience, and of evenness of temper. He should be affected by nothing, surprised by nothing. His bodily health should be sound, his brain cool, and his digestion excellent. He was liable to be summoned from his bed at any hour of the night to investigate a new crime; and when he entered his cabinet tranquilly at one o'clock in the afternoon, it was possible that a minute afterward he would be leaving it hastily on the trail of a fresh offence against justice. In Paris, these magistrates, twenty-eight in number,--with the exception of two who sat in the Petit Parquet,--occupied the three upper stories of the Palais; in the antechamber of each, under the eye of an attendant, or _garçon de bureau_, might be found waiting, more or less impatiently, a number of witnesses and persons interested, from all classes of society. In the inner room, before the magistrate seated at his desk, and flanked by his greffier, the prisoner or the suspected criminal, guarded by two soldiers of the Garde Municipale, would be undergoing his examination,--badgered, bullied, cross-examined, threatened, matching his dull and unaccustomed wits against the keener, trained, and experienced ones of the judge, outmatched at every point, and but too frequently failing to demonstrate his innocence which it should have been as much the care of his examiner as his own to demonstrate. [Illustration: SENTRY OF THE GARDE RÉPUBLICAINE BEFORE THE OPERA-HOUSE. After a water-color by Pierre Vidal.]