The present encounter, being merely one of apathetic greeting, did not afford the opportunity. Penrod took off his cap, and Roderick, seated between his mother and one of his grown-up sisters, nodded sluggishly, but neither Mrs. Magsworth Bitts nor her daughter acknowledged the salutation of the boy in the yard. They disapproved of him as a person of little consequence, and that little, bad. Snubbed, Penrod thoughtfully restored his cap to his head. A boy can be cut as effectually as a man, and this one was chilled to a low temperature. He wondered if they despised him because they had seen a last fragment of doughnut in his hand; then he thought that perhaps it was Duke who had disgraced him. Duke was certainly no fashionable looking dog. The resilient spirits of youth, however, presently revived, and discovering a spider upon one knee and a beetle simultaneously upon the other, Penrod forgot Mrs. Roderick Magsworth Bitts in the course of some experiments infringing upon the domain of Doctor Carrel. Penrod's efforts--with the aid of a pin--to effect a transference of living organism were unsuccessful; but he convinced himself forever that a spider cannot walk with a beetle's legs. Della then enhanced zoological interest by depositing upon the back porch a large rat-trap from the cellar, the prison of four live rats awaiting execution. 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 After a time, the student's attention was withdrawn from his specimens by a peculiar smell, which, being followed up by a system of selective sniffing, proved to be an emanation leaking into the stable from the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. Duke, who had shown not the slightest interest in the rats, set up a frantic barking and simulated a ravening assault upon the strange animal. It was only a bit of acting, however, for Duke was an old dog, had suffered much, and desired no unnecessary sorrow, wherefore he confined his demonstrations to alarums and excursions, and presently sat down at a distance and expressed himself by intermittent threatenings in a quavering falsetto.