They had then come to England, and had lived in lodgings in London.

For a time they had been miserably poor.

But, after her mother's death--a sudden death from heart disease--there had come a change in their affairs, which she was quite unable to explain.

They had removed to their present abode, to give the doctor full accommodation for the carrying on of his scientific pursuits.

He often had occasion to go to London; but never took her with him.