In a side-room of the main hall of the Central Police Headquarters, on the second story, in Mulberry street, is a desk at which sits an old rosy-cheeked, white-headed police officer, named McWaters. McWaters is famous in New York. He is the theatrical critic of the Police Department. His opinions on music and the drama are of weighty authority among members of the force, and, like most critics, he is dogmatic and forcible.