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. _An_ extension _of a well-established theory to the explanation of new facts excites admiration as a discovery; but it is a discovery of a lower order than the theory itself._ APHORISM LVII. _The practical inventions which are most important in Art may be either unimportant parts of Science, or results not explained by Science._ {234} APHORISM LVIII. _In modern times, in many departments. Art is constantly guided, governed and advanced by Science._ APHORISM LIX. _Recently several New Arts have been invented, which may be regarded as notable verifications of the anticipations of material benefits to be derived to man from the progress of Science._ 1. BY the application of inductive truths, we here mean, according to the arrangement given in chap. I. of this book, those steps, which in the natural order of science, follow the discovery of each truth. These steps are, the _verification_ of the discovery by additional experiments and reasonings, and its _extension_ to new cases, not contemplated by the original discoverer. These processes occupy that period, which, in the history of each great discovery, we have termed the _Sequel_ of the epoch; as the collection of facts, and the elucidation of conceptions, form its Prelude.