Mrs. Hazleton sat in the library that night for two or three hours, and studied diligently a large folio volume which she had taken down herself. She read, and she seemed puzzled. A servant entered to ask some unimportant question, and she waved him away impatiently. Then leaning her head upon her hand she thought profoundly. She calculated in her own mind what Emily knew--how much--how intimately, and how she had learned it. Such a thing as remorse she knew not; but she had some fear, though very little--a sort of shrinking from the commission of acts more daring and terrible than any she had yet performed. There was something appalling--there is always something appalling--in the commission of a great new crime, and the turning back, as it were, of the mind of Mrs. Hazleton from the search for means to accomplish a deed determined, in order to calculate the necessity of that deed, proceeded from this sort of awe at the next highest step of evil to those which she had already committed.

"She must know all," said Mrs. Hazleton to herself, after having considered the matter for some moments deeply. "And she must have learned it accurately. I know her caution well. From whom can she have learned it?"

"From that young villain Ayliffe," was the prompt reply. "I was too harsh with him, and in his fit of rage he has gone away at once to tell this girl--or perhaps that old fool Dixwell. Most likely he has furnished her with evidence too, before he fled the country. Without that I could have set Marlow's discoveries at naught. Yet I doubt his having gone to Dixwell; he always despised him. Mean as he was himself; he looked upon him as a meaner. He would not go to him to whine and cant over him. He would go to the girl herself. Her he always loved, even in the midst of his violence and his rage. He would go to her or write to her beyond all doubt. She must be silenced. But I must deal with another first. Come what will, this marriage shall not take place. Besides, she is the most dangerous of the two. The girl might be frightened or awed into secresy, and it will take longer time to reach her, but nothing will keep that weak woman's tongue from babbling, and in four and twenty hours her consent will be given to this marriage. If I can but contrive it rightly, that at least may be stopped, and a part of my revenge obtained at all events. It must be so--it must be so."

She turned to the leaves of the book again, but nothing in the contents seemed to give her satisfaction. "That will be too long," she said, after having read about a third of a page. "Three or four days to operate! Who could wait three or four days when the object is security, tranquility, or revenge? Besides the case admits of no delay. Before three of four days all will be over."

She read again, and was discontented with what she read. "That will leave traces," she said. "It must be the Italian's dose, I believe, after all. Those monks are very skilful men, and perhaps it may not have lost its efficiency. It is easily tried," she exclaimed suddenly, and ascending quietly to her own dressing-room, she sought out from the drawer of an old cabinet a small packet of white powder, which she concealed in the palm of her hand. Then descending to the library again, she sat for a few minutes in dull, heavy thought, and then rang a hand-bell which stood upon her table.

"Bring me a small quantity of meat cut fine for the dog," she said, as soon as her servant appeared. "He seems ill; what has been the matter with him?"

"Nothing, madam," said the man, looking under the table where lay a beautiful small spaniel sound asleep. "He has been quite well all day."

"He has had something like a fit," said Mrs. Hazleton.

"Dear me, perhaps he is going mad," replied the man. "Had I not better kill him?"

"Kill him!" exclaimed Mrs. Hazleton; "on no account whatever. Bring me a small plate of meat."