In the rural districts, these receivers of stolen goods are quite unknown, except among the thieves themselves, unless some unusually active deputy sheriff makes the discovery; but in the cities, especially in New York and Brooklyn, they are as well known to the police officers as the city halls of those places. These officers are sure that everything they have in their warehouses is stolen; they are acquainted with their ways of doing business; and they know what thieves resort to each, and where they dispose of their ill-gotten property. Yet this knowledge avails but little in promoting the ends of justice. It is but rarely that any of this class are convicted of their offences. The reason is that strict legal proof of their guilt can very seldom be procured. The study of the means of rapidly and effectually removing the marks by which the property in their hands can be identified, is the main business of their lives, and they acquire a degree of skill and dexterity in altering or effacing these marks, which is truly surprising. A melting-pot is always over the fire, to which all silver ware is consigned the instant it is received. The marks on linen, towels, and handkerchiefs, are removed, sometimes by chemicals, sometimes by fine scissors made expressly for the purpose. Jewelry is at once removed from its settings, and the gold is either melted or the engraving is burnished out, so as in either case to make identification impossible. Rich velvet and silk garments are transmogrified by the removal and re-arrangement of the buttons and trimmings. Pointed edges are rounded, and rounded edges are pointed, entirely changing the whole aspect of the garment, with such celerity that the lady who had worn the dress in the morning would not have the slightest suspicion that it was the same in the evening. Cotton, wool, rags, and old ropes, require no manipulation. When once thrown upon the heap, they defy the closest scrutiny of the owners. There is scarcely an article which can be the subject of theft, which the resources of these men do not enable them, in a very short time, to disguise beyond the power of recognition. Their premises are skilfully arranged for concealment. They are abundantly provided with secret doors and sliding panels, communicating with dark recesses. Apertures are cut in the partitions, so that a person coming in from the front can be distinctly seen before he enters the apartment. The 'fence' is as well skilled as any lawyer in the nature of evidence. He knows the difference between probability and proof as well as Sir William Hamilton himself. He does not trouble himself about any amount of _probabilities_ that the detectives may accumulate against him; but the said detective must be remarkably acute if he is ever able to get anything against him which will amount to strictly legal proof. CHAPTER XLI. PICKPOCKETS.