Penrod at once took possession, retiring to the empty stable, where he installed the rats in a small wooden box with a sheet of broken window-glass—held down by a brickbat—over the top. Thus the symptoms of their agitation, when the box was shaken or hammered upon, could be studied at leisure. Altogether this Saturday was starting splendidly.
After a time, the student's attention was withdrawn from his specimens by a peculiar smell, which, being followed up by a system of selective sniffing, proved to be an emanation leaking into the stable from the alley. He opened the back door.
Across the alley was a cottage which a thrifty neighbour had built on the rear line of his lot and rented to negroes; and the fact that a negro family was now in process of "moving in" was manifested by the presence of a thin mule and a ramshackle wagon, the latter laden with the semblance of a stove and a few other unpretentious household articles.
A very small darky boy stood near the mule. In his hand was a rusty chain, and at the end of the chain the delighted Penrod perceived the source of the special smell he was tracing—a large raccoon.
