1. Introductory
2. False "facts" and false inference
3. Grounds of inference
4. Generalisation, analogy, and circumstantial evidence
5. The discovery of underlying theories
6. Syllogism, or inference in the abstract
7. Kinds of generalisation
8. Observation and generalisation
9. Generalisation and criticism
10. The notion of a "cause"
11. The search for a causal explanation
12. Agreement and difference: quantity and quality of evidence
13. General results
Appendix
A. Notes on the 'technicalities of logic
B. Structure of the syllogism
C. The universality of the major premiss
D. The typical form of syllogism
E. Essential resemblance and difference.