All perils, specially malignant, are recurrent. A murderer, who is such by passion and by a wolfish craving for bloodshed as a mode of unnatural luxury, cannot relapse into _inertia_. Such a man, even more than the Alpine chamois hunter, comes to crave the dangers and the hairbreadth escapes of his trade, as a condiment for seasoning the insipid monotonies of daily life. But, apart from the hellish instincts that might too surely be relied on for renewed atrocities, it was clear that the murderer of the Marrs, wheresoever lurking, must be a needy man; and a needy man of that class least likely to seek or to find resources in honorable modes of industry; for which, equally by haughty disgust and by disuse of the appropriate habits, men of violence are specially disqualified. Were it, therefore, merely for a livelihood, the murderer whom all hearts were yearning to decipher, might be expected to make his resurrection on some stage of horror, after a reasonable interval. Even in the Marr murder, granting that it had been governed chiefly by cruel and vindictive impulses, it was still clear that the desire of booty had co-operated with such feelings. Equally clear it was that this desire must have been disappointed: excepting the trivial sum reserved by Marr for the week's expenditure, the murderer found, doubtless, little or nothing that he could turn to account. Two guineas, perhaps, would be the outside of what he had obtained in the way of booty. A week or so would see the end of that. The conviction, therefore, of all people was, that in a month or two, when the fever of excitement might a little have cooled down, or have been superseded by other topics of fresher interest, so that the newborn vigilance of household life would have had time to relax, some new murder, equally appalling, might be counted upon.