§§ 1, 2. Indication of the nature of a Law of Error or Divergence.
3. Is there necessarily but one such law,
4. Applicable to widely distinct classes of things?
5, 6. This cannot be proved directly by statistics;
7, 8. Which in certain cases show actual asymmetry.
9, 10. Nor deductively;
11. Nor by the Method of Least Squares.
12. Distinction between Laws of Error and the Method of Least Squares.
13. Supposed existence of types.
14–16. Homogeneous and heterogeneous classes.