These are a few specimens of what may be found in the books, pointing out the gradual approach of Scientific investigation to the discovery of a Unitary Law, and the expectation among Scientists of the advent, at some period not far distant, of a new Science, the greatest among Sciences, a true Pantology or Universology. Upon the apprehension of this Law, which must establish the true basis of every domain of thought or activity, and show it to be identical or analogous in the several domains, we shall be placed, _in relation to the whole universe_, precisely 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.