In the preceding chapter the writer discussed at some length the real, as distinguished from the fancied, attributes of detectives in general, and the weaknesses as well as the virtues of the so-called detective "agency." There are in the city of New York at the present time about one hundred and fifty licensed detectives. Under the detective license laws each of these has been required to file with the State comptroller written evidences of his competency, and integrity, approved by five reputable freeholders of his county, and to give bond in the sum of two thousand dollars. He also has to pay a license fee of one hundred dollars per annum, but this enables him to employ as many "operators" as he chooses. In other words, the head of the agency may be of good character and his agents wholly undesirable citizens. How often this is the case is known to none better than the heads themselves. The strength and efficiency of a detective agency does not lie in the name at the top of its letter-paper, but in the unknown personnel of the men who are doing or shirking the work. I believe that most of the principals of the many agencies throughout the United States are animated by a serious desire to give their clients a full return for their money and loyal and honest service. But the best intentions in the world cannot make up for the lack of untiring vigilance in supervising the men who are being employed in the client's service. It is the right here that the "national" has an immense advantage over the small agency which cannot afford to keep a large staff of men constantly on hand, but is forced to engage them temporarily as they may be needed. The "national" agency can shift its employees from place to place as their services are required, and the advantages of centralization are felt as much in this sort of work as in any other industry. The licensed detective who sends out a hurry call for assistants is apt to be able to get only men whom he would otherwise not employ. In this chapter, the word "national," as applied to a detective agency, refers not to the title under which such an agency may do its business, but to the fact that it is organized and equipped to render services all over the country.