Mrs. Wilkins sometimes has trouble sleeping. In order to determine the cause, she decided to take note of her pre-bedtime behavior over the course of a week. On Monday she drank chamomile tea, had a late dinner, took a hot bath, read from a book, took a walk, and slept well. On Tuesday she had a late dinner, read from a book, and slept poorly. On Wednesday she drank a glass of wine, got a massage, took a walk, and slept poorly. On Thursday she had a late dinner, drank a glass of wine, read from a book, took a hot bath, got a massage, and slept well. On Friday she read from a book, drank chamomile tea, got a massage, had a late dinner, took a walk, and slept well. On Saturday she drank a glass of wine, got a massage, took a walk, drank chamomile tea, took a hot bath, and slept well. On Sunday she read from a book, took a hot bath, drank chamomile tea, and slept poorly. What can Mrs. Wilkins conclude is the cause of sleeping well? Construct a table that supports this conclusion. Which one of Mill's methods did Mrs. Wilkins use? What sense of causality is involved in the conclusion?