The further examination of the witness was suspended while the hidden bottle was compared with the bottles properly belonging to the dressing-case.
These last were of the finest cut glass, and of a very elegant form--entirely unlike the bottle found in the private repository, which was of the commonest manufacture, and of the shape ordinarily in use among chemists. Not a drop of liquid, not the smallest atom of any solid substance, remained in it. No smell exhaled from it--and, more unfortunately still for the interests of the defense, no label was found attached to the bottle when it had been discovered.
The chemist who had sold the second supply of arsenic to the prisoner was recalled and examined. He declared that the bottle was exactly like the bottle in which he had placed the arsenic. It was, however, equally like hundreds of other bottles in his shop. In the absence of the label (on which he had himself written the word "Poison"), it was impossible for him to identify the bottle. The dressing-case and the deceased lady's bedroom had been vainly searched for the chemist's missing label--on the chance that it might have become accidentally detached from the mysterious empty bottle. In both instances the search had been without result. Morally, it was a fair conclusion that this might be really the bottle which had contained the poison. Legally, there was not the slightest proof of it.
Thus ended the last effort of the defense to trace the arsenic purchased by the prisoner to the possession of his wife. The book relating the practices of the Styrian peasantry (found in the deceased lady's room) had been produced But could the book prove that she had asked her husband to buy arsenic for her? The crumpled paper, with the grains of powder left in it, had been identified by the chemist, and had been declared to contain grains of arsenic. But where was the proof that Mrs. Eustace Macallan's hand had placed the packet in the cabinet, and had emptied it of its contents? No direct evidence anywhere! Nothing but conjecture!
The renewed examination of Miserrimus Dexter touched on matters of no general interest. The cross-examination resolved itself, in substance, into a mental trial of strength between the witness and the Lord Advocate; the struggle terminating (according to the general opinion) in favor of the witness. One question and one answer only I will repeat here. They appeared to me to be of serious importance to the object that I had in view in reading the Trial.
"I believe, Mr. Dexter," the Lord Advocate remarked, in his most ironical manner, "that you have a theory of your own, which makes the death of Mrs. Eustace Macallan no mystery to you?"