CHAPTER XXII.

QUANTITATIVE INDUCTION.

1. Quantitative Induction 483

2. Probable Connexion of Varying Quantities 484

3. Empirical Mathematical Laws 487

4. Discovery of Rational Formulæ 489

5. The Graphical Method 492

6. Interpolation and Extrapolation 495

7. Illustrations of Empirical Quantitative Laws 499

8. Simple Proportional Variation 501