sely where we now stand in relation to Mathematics, Mechanics, and
Physics; that is, the General Law or Laws of every domain of
investigation will become known, as we now know those of these Sciences,
and, to adopt the words of the French writer, 'from them the mind may
proceed to the logical construction of the Science [being now the
Science of the whole Universe], without further reference to the
external world;' or to use the language of Professor Silliman, 'when the
general laws of [the Universe] are known, we may _deduce_ from them, by
a series of rigorous reasonings, _all the phenomena to which they give
rise_.' Thus, upon the discovery of a Unitary Law, linking the Sciences
together, and showing the identity of their starting points or bases,
the Deductive Principle, considered either as a Method or a Process,
must once more take the lead, and the Inductive occupy its legitimate
position as a subordinate and corroborative auxiliary. Under the
guidance of this new adjustment of the Deductive and Inductive
Principles, a full, exact, complete, definite, _Scientific_
Classification of our knowledge will become possible, and the true
boundaries of every domain of intellectual examination may be critically
and clearly established. In the absence of such a Classification, it is
only by viewing departments of the Universe with reference to the Method
or Process employed in the investigation of their Phenomena, that we are
able to estimate their present relations to Science, and to ascertain
proximately their Scientific or Unscientific character. We proceed,
then, to examine the connection of History, in its present development,
with Science, a task to which the foregoing brief and incomplete
consideration of the subject of Method has been a necessary preliminary.

A number of Classifications of human knowledge have been attempted, none
of which were exact or complete, or could have been, for a reason which
was stated above, and none of which are now considered to be
satisfactory by the Scientific world. Bacon and D'Alembert, men of
vigorous and vast intellectual capacity, were admirably adapted to such
a work, so far as it could be performed in their day. But the state of
knowledge and Scientific progress was not sufficiently advanced, at that
time, to render any Classification which could be made of more than
temporary value, and those furnished by these illustrious thinkers now
appertain only to the archaeology of Scien