Sarah Purday was convicted, and sentenced to transportation. I did not forget my promise; and a statement of the previously-narrated circumstances having been drawn up and forwarded to the Queen and the Home Secretary, a pardon, after some delay, was issued. There were painful circumstances in her history which, after strict inquiry, told favorably for her. Several benevolent persons interested themselves in her behalf, and she was sent out to Canada, where she had some relatives, and has, I believe, prospered there. This affair caused considerable hubbub at the time, and much admiration was expressed by the country people at the boldness and dexterity of the London "runner;" whereas, in fact, the successful result was entirely attributable to the opportune revelations of Sarah Purday. Sketches OF THE LONDON DETECTIVE FORCE, FROM DICKENS' "HOUSEHOLD WORDS." Part XI. THE MODERN SCIENCE OF THIEF-TAKING. If thieving be an Art (and who denies that its more subtle and delicate branches deserve to be ranked as one of the Fine Arts?), thief-taking is a Science. All the thief's ingenuity, all his knowledge of human nature; all his courage; all his coolness; all his imperturbable powers of face; all his nice discrimination in reading the countenances of other people; all his manual and digital dexterity; all his fertility in expedients, and promptitude in acting upon them; all his Protean cleverness of disguise and capability of counterfeiting every sort and condition of distress; together with a great deal more patience, and the additional qualification, integrity, are demanded for the higher branches of thief-taking. If an urchin picks your pocket, or a bungling "artist" steals your watch so that you find it out in an instant, it is easy enough for any private in any of the seventeen divisions of London Police to obey your panting demand to "Stop thief!" But the tricks and contrivances of those who wheedle money out of your pocket rather than steal it; who cheat you with your eyes open; who clear every vestige of plate out of your pantry while your servant is on the stairs; who set up imposing warehouses, and ease respectable firms of large parcels of goods; who steal the acceptances of needy or dissipated young men;--for the detection and punishment of such impostors a superior order of police is requisite. To each division of the Force is attached two officers, who are denominated "detectives." The staff, or head-quarters, consists of six sergeants and two inspectors. Thus the Detective Police, of which we hear so much, consists of only forty-two individuals, whose duty it is to wear no uniform, and to perform the most difficult operations of their craft. They have not only to counteract the machinations of every sort of rascal whose only means of existence is avowed rascality, but to clear up family mysteries, the investigation of which demands the utmost delicacy and tact.