Much to his surprise, he saw Hendrickson leave soon after for Boston.

On examining the register, he learned that his destination was Albany.
A momentary relief was experienced at this departure; but soon mystery was suggested, and a mutual understanding between his wife and Hendrickson imagined.

And so fuel was heaped on the fires of jealousy, which blazed up again as fiercely as ever.

The seclusion of herself in her own room by Mrs.Dexter, following as it did immediately on the departure of Hendrickson, confirmed him in the impression that she was deeply interested in her old lover.

How else could he interpret her conduct?
If she were really sick, conflict of feeling, occasioned by his presence, was the cause.