WHEN Olga went to her room that night in St. Petersburg, instead of going to bed, she unpacked from her valise a series of articles which seemed strange possessions for a young girl of not quite seventeen to travel with on her wedding journey. First came a tiny spirit furnace from which, by the aid of an arrangement something like the modern blow-pipe, an intense heat could be obtained. Then a delicate pair of scales, a glass pestle and mortar, and a couple of glass liquid-measures, and lastly, half a dozen little phials filled with variously-coloured liquids, and as many little packets of powders, that looked like herbs ground very finely. When she had placed these out on the table, after having carefully locked the door of her room, and seen that the windows were completely shuttered and curtained, she drew from the bosom of her dress a gold chain, at the end of which was fastened, together with the key of the secret recess in the wall of the turret chamber of the house at Hampstead, a small bag of silk, out of which she took a little roll of parchment,--the slip which she had abstracted from Paul Romanoff’s secret will after she had persuaded Serge, with her false kisses, to leave her alone for a while. She seated herself at the table, drew the electric reading-lamp which stood on it close to her, laid the slip down in front of her, keeping it unrolled by means of a couple of little weights, and studied it intently for several minutes. Then she made a series of calculations on another sheet of paper, and compared the result carefully with some figures on the slip. She made them three times over before she was satisfied that they were absolutely correct, and then, with all the care and deliberation of a chemical analyst performing a delicate and important experiment, she proceeded to weigh out tiny quantities of the powders, and to mix them very carefully in the little glass mortar. This done, she emptied the mixture into a little platinum crucible, which she placed on the furnace, at the same time applying a gentle heat. Then she turned her attention to the phials, measuring off quantities of their contents with the most scrupulous exactitude, mixing them two and two, and adding this mixture to a third, and so on, in a certain order which was evidently prearranged, as she constantly referred to the slip of parchment and her own calculations as she was mixing them. By the time she finished this part of her work, she had obtained from the various coloured liquids one perfectly colourless and odourless, of a specific gravity apparently considerably in excess of that of water, although, at the same time, it was extremely mobile and refractive. She held it up to the light, looking at it with her eyelids somewhat screwed up, and with a cruel smile on her pretty lips.