The Methods of Induction which are treated of in this and the preceding chapter, and which are specially applicable to causes governed by relations of Quantity or of Resemblance, commonly lead us to Laws of Phenomena only. Inductions founded upon other ideas, those of Substance and Cause for example, appear to conduct us somewhat further into a knowledge of the essential nature and real connexions of things. But before we speak of these, we shall say a few words respecting the way in which inductive propositions, once obtained, may be verified and carried into effect by their application.
CHAPTER IX.
Of the Application of Inductive Truths.
Aphorism LIII.
When the theory of any subject is established, the observations and experiments which are made in applying the science to use and to instruction, supply a perpetual verification of the theory.
Aphorism LIV.
Such observations and experiments, when numerous and accurate, supply also corrections of the constants involved in the theory; and sometimes, (by the Method of Residues,) additions to the theory.
Aphorism LV.
It is worth considering, whether a continued and connected system of observation and calculation, like that of astronomy, might not be employed with advantage in improving our knowledge of other subjects; as Tides, Currents, Winds, Clouds, Rain, Terrestrial Magnetism, Aurora Borealis, Composition of Crystals, and many other subjects.
Aphorism LVI.