It has been already remarked in these pages that with changed social conditions came a great change in the character of crimes. Highway robberies, for instance, had disappeared, if we except the spasmodic and severely repressed outbreak of "garrotting," which at one time spread terror throughout London. Thieves preferred now to use ingenuity rather than brute force. It was no longer possible to stop a coach or carriage, or rob the postman who carried the mail. The improved methods of locomotion had put a stop to these depredations. People travelled in company, as a rule; only when single and unprotected were they in any danger of attack, and that but rarely. There were still big prizes, however, to tempt the daring, and none appealed more to the thievish instinct than the custom of transmitting gold by rail. The precious metal was sent from place to place carefully locked up and guarded, no doubt; but were the precautions too minute, the vigilance too close to be eluded or overcome? This was the question which presented itself to the fertile brain of one Pierce, who had been concerned in various "jobs" of a dishonest character, and who for the moment was a clerk in a betting office. He laid the suggestion before Agar, a professional thief, who thought it contained elements of success. But the collusion and active assistance of employees of the railway carriers were indispensable, and together they sounded one Burgess, a guard on the South-Eastern Railway, a line by which large quantities of bullion were sent to the Continent. Burgess detailed the whole system of transmission. The gold, packed in an iron-bound box, was securely lodged in safes locked with patent Chubbs. Each safe had three sets of double keys, all held by confidential servants of the company. One pair was with the traffic superintendent in London, another with an official in Folkestone, a third with the captain of the Folkestone and Boulogne boat. At the other side of the Channel the French railway authorities took charge.