Chapter X. _of Plurality of Causes; and of the Intermixture

of Effects._

§ 1. One effect may have several causes 482

2. --which is the source of a characteristic imperfection of the Method of Agreement 483

3. Plurality of Causes, how ascertained 487

4. Concurrence of Causes which do not compound their effects 489

5. Difficulties of the investigation, when causes compound their effects 494

6. Three modes of investigating the laws of complex effects 499

7. The method of simple observation inapplicable 500

8. The purely experimental method inapplicable 501