The first duty of a policeman, no matter what kind of a police force he belongs to, is to inform himself in regard to the people in his bailiwick who are likely to give him trouble. In a municipal force an officer can only be required to know thoroughly the situation on his particular beat; if he can inform himself about other districts as well, he is so much more valuable to the department, but he is not expected to do much more than get acquainted with the people under his immediate surveillance. In a railroad police force it is different, and it is required of the officer that he study carefully the criminal situation in all the towns and villages on the division on which he is stationed.…
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