One day last summer a large handsome black cat walked gravely up one side of Main street, crossed, and went half-way down the other. He stopped at a house called The Den, went up the piazza steps, and paused by an open window.A lady sitting inside saw and spoke to him; but without taking any notice, he put his paws on the sill, looked around the room as if wondering if it would suit him, and finally gazed into her face.