The development of crime detection in the last decade has followed closely along the line of industrial development.

Just as no great commercial establishment can long survive without systematic management, so no great detective force can develop efficiency with chaos on the throne.
Centralization, through closer and ever more close systematization, has not only been the tendency, but the great phenomenon of the modern industrial world.

The same condition obtains to-day in the police profession.
A detective force, like the New York Central Office, is managed much the same way as a big commercial enterprise.

Under modern conditions every large mercantile establishment must depend for success on the wisdom of its directing genius combined with the intelligent cooperation of its army of subordinates.

In similar manner, the head of a big detective bureau directs the efforts of his men to success or failure.
Moreover, the same qualities by which a man attains commercial eminence will win distinction for him as a detective.