One dark night last week two men watched a house near Park Avenue, Manhattan. A woman came out, glanced about her, bent down, sprinkled a powder about each house corner, quietly disappeared indoors. The two men gathered up pinches of the powder from the sidewalk, took the pinches to a chemist to be analyzed. As they had suspected, it was arsenic.
The two men, agents for the A. S. P. C. A., had been assigned to the Park Avenue district to catch poison-sprinklers who have been endangering the lives of expensive Park Avenue...