There was an interval of almost breathless suspense as, upon the Coroner's instructions, an officer left the Court. Dick looked forward to the entrance of Dr. Pye with no less curiosity than the other spectators, but mingled with this curiosity was an element of alarm. Dark forebodings crossed his mind; he feared he knew not what, but still he smiled confidently at Florence when she turned imploringly to him, for she also was in that state of tension which made every fresh feature of the inquiry a terrifying presage. Presently the officer returned, followed by Dr. Pye. The new witness was tall, with a slight stoop in his shoulders, his face was ashen grey, his brows knit and concentrated, his eyes habitually downcast, but, when raised, irradiated with a keen steady light, giving one the impression that the pupils might be of steel, which was indeed their colour, his mouth with its thin long lips compressed, his hands long and nervous, his voice calm, clear, and deliberate, his manner altogether that of a man of supreme moral strength and self-possession, who could hold his passions in control, and make them subservient to his will. "In volunteering a communication which may have some relation to your inquiry," he said, addressing the Coroner, without bestowing a glance upon the spectators, "I am impelled simply by a sense of public duty. As to its value you will be the best judge. What I have to offer to the Court is merely the narration of an occurrence which came under my observation on the night of Friday, the 1st of March, when I was making some experiments in chemistry in a room at the back of my house in Shore Street, the window in which looks out upon Catchpole Square, and commands a front view of the house in which Mr. Samuel Boyd resided. It is my habit to work late, and it was not till three in the morning that my labours were at an end. At that hour I was standing at the window, gazing aimlessly into the solitude of Catchpole Square, when my attention was arrested by movements at Mr. Boyd's street door. It was gradually opened, and the form of a man emerged from the house. The night was dark, and what I saw was necessarily dim and uncertain in my sight, but it appeared to me that the man, halting on the threshold, lingered in the attitude of a person who wished to escape observation. This impression impelled me to a closer scrutiny of the man's movements. I have in my room a device of my own construction in the shape of a small box containing a coil of magnesium wire. By withdrawing the curtain from a glass globe set in this box, and by pressing a spring, I can, upon lighting the wire, throw a powerful light upon objects at a great distance, remaining myself in darkness. There appeared to me to be something so suspicious in the shadowy movements of the person at Mr. Boyd's door at such an hour that I brought my box to the window, and threw the light upon the Square. It