At 5 o'clock, Dorcas finds her mistress in a state of considerable agitation, with a slip of paper ”'a letter,' Dorcas thinks ”in her hand, and it is then that 158 she orders the fire in her room to be lighted. 
At 5 o'clock, Dorcas finds her mistress fast asleep.
mnli hypothesis: At 5 o'clock, Dorcas finds her mistress fast asleep. premise: At 5 o'clock, Dorcas finds her mistress in a state of considerable agitation, with a slip of paper ”'a letter,' Dorcas thinks ”in her hand, and it is then that 158 she orders the fire in her room to be lighted. 