It is this necessity, this occult but permanent connection, this periodical
recurrence in the progressive development of forms, phenomena, and events,
which constitute 'nature', obedient to the first impulse imparted to it.
Physics, as the term signifies, is limited to the explanation of the
phenomena of the material world by the properties of matter. The ultimate
object of the experimental sciences is, therefore, to discover laws, and to
trace their progressive generalization. All that exceeds this goes beyond
the province of the physical description of the universe, and appertains to
a range of higher speculative views.
Emmanuel Kant, one of the few philosophers who have escaped the imputation
of impiety, has defined with rare sagacity the limits of physical
explanations, in his celebrated essay 'On the Theory and Structure of the
Heavens', published at Konigsberg in 1755.
The study of a science that promises to lead us through the vast range of
creation may be compared to a journey in a far-distant land. Before we set
forth, we consider, and often with distrust, our own strength, and that of
the guide we have chosen. But the apprehensions which have originated in
the abundance and the difficulties attached to the subjects we would
embrace, recede from view as we remember that with the increase of
observations in the present day there has also arisen a more intimate
knowledge of the connection existing among all phenomena.
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