Trilby was the dog. As far back as my memory reaches there was never another in Cat Alley. She arrived in the block one winter morning on a dead run, with a tin can tied to her stump of a tail, and with the Mott Street gang in hot pursuit. In her extremity she saw the mouth of the alley, dodged in, and was safe. The Mott Streeters would as soon have thought of following her into police headquarters as there. Ever after she stayed. She took possession of the alley and of headquarters, where the reporters had their daily walk, as if they were hers by right of conquest, which in fact they were. With her whimsically grave countenance, in which all the cares of the vast domain she made it her daily duty to oversee were visibly reflected, she made herself a favorite with every one except the "beanery-man" on the corner, who denounced her angrily, when none of her friends were near, for coming in with his customers at lunch-time on purpose to have them feed her with his sugar, which was true. At regular hours, beginning with the opening of the department offices, she would make the round of the police building and call on all the officials, forgetting none. She rode up in the elevator and left it at the proper floors, waited in the anterooms with the rest when there was a crowd, and paid stated visits to the chief and the commissioners, who never omitted to receive her with a nod and a "Hello, Trilby!" no matter how pressing the business in hand. The gravity with which she listened to what went on, and wrinkled up her brow in an evident effort to understand, was comical to the last degree. She knew the fire alarm signals and when anything momentous was afoot. On the quiet days, when nothing was stirring, she would flock with the reporters on the stoop and sing. There never was such singing as Trilby's. That was how she got her name. I tried a score of times to find out, but to this day I do not know whether it was pain or pleasure that was in her note. She had only one, but it made up in volume for what it lacked in range. Standing in the circle of her friends, she would raise her head until her nose pointed straight toward the sky, and pour forth her melody with a look of such unutterable woe on her face that peals of laughter always wound up the performance; whereupon Trilby would march off with an injured air, and hide herself in one of the offices, refusing to come out. Poor Trilby! with the passing away of the alley she seemed to lose her grip. She did not understand it. After wandering about aimlessly for a while, vainly seeking a home in the world, she finally moved over on the East Side with one of the dispossessed tenants. But on all Sundays and holidays, and once in a while in the middle of the week, she comes yet to inspect the old block in Mulberry Street and to join in a quartette with old friends. [Illustration: Old Barney.]