the cotton batting. It was surmised that the murderers might have buried their tell-tale evidences of their bloody work in the cellar, and later in the day a half-dozen detectives from the Chicago Avenue station dug the place over to a depth of several feet. Nothing, however, was brought to light. FORMING A THEORY. In the light of the surroundings a theory of the circumstances under which the crime was committed was easily formed. Than the place itself a better one for such a purpose could not have been found. The street was absolutely dark after midnight, and even during the early evening the only outside light was that given by two kerosene lamps, one at each of the street intersections. Hence it was in comparative darkness all the evening. The house, moreover, was so near that of Sullivan's that it was probably an easy matter to decoy Dr. Cronin to it without arousing his suspicions. He had been struck the moment he entered the parlor, and fell in the corner of the room where the largest of the blood-stains appeared. The blow, however, had not deprived him of consciousness, and, gaining his feet he had engaged in a hand-to-hand struggle with his assailants. This was apparent from the manner in which the blood was spattered over the articles of furniture that were several feet distant from each other. It had evidently been in this struggle that the arm of the rocking-chair was broken. Another terrific blow had been dealt his head while he retreated backward, as was evidenced by the hair and blood upon the wall. The last foul blow having been struck, the unfortunate man, perhaps still breathing, was stripped naked and the body packed into the trunk, which was already in the house. Having thus disposed of the corpse the trunk was borne out of the building to the wagon, which stood on the roadside. As it was being carried down the steps the blood that gathered at one end seeped through the corners and left the two gory trails on the boards of the sidewalk and the plank crossing the ditch. Then there was the hurried drive to the catch-basin, the dumping of the body, still warm, into its recesses, and the disposal of the trunk. The murder having thus been accomplished and the body disposed of, the conspirators, with strange assurance of their safety, had returned to the cottage and endeavored to efface the evidence of their crime by taking up the carpet and then plastering the blood-stains with the paint--a mixture of yellow and brown ochre. Either they were in a hurry or there had been some interruption, for the job was not half done and the murderers, leaving behind all the evidences of their atrocious deed, vacated the cottage for good and all. THE BLOOD EXAMINED BY EXPERTS.