A great group of photos shows two cops as a city kid would see them; a simple text tells what they're doing and why. Both emphasize assistance, prevention, deterrence -- but a burglar is chased over rooftops, caught and handcuffed. The result is a book that elicits identification and encourages a constructive attitude without looking like a recruiting poster or sounding like a school assembly. One of the two is a Negro, and both are seen at home with their families; interspersed is incidental information about earning a badge, incidental shots of policemen with their perquisites--a patrol car, a motorcycle, a horse. Active and attractive--easily the best for city neighborhoods, with a field trip bonus for sheltered suburbanites.