It will be sufficiently evident from this brief statement, that _The Philosophy of History_ (not _History_, as the letter says) which constitutes the Dynamic Branch of Sociology in the Positive System is, in Comte's own intention and showing, a series of bald abstractions from which the _substantial_ or _concrete_ elements of individual and national activity, the proximate causes of Human Progress, are dropped out; and that _History_ in the ordinary sense of that term, or in the broader sense in which it has been used in these papers, as referring to a possible Science, finds no place in his Scientific Schedule. The error into which our critic has fallen, in this case, undoubtedly resulted in part from the unfortunate confounding of the words _Philosophy_ and _Science_, which pervades the Positive System. Philosophy and Science are not, in any proper use of the terms, synonymes. They relate--as it is designed at some future time to show--to equally true and important, though _opposite_ aspects of the Universe, considered either as a whole or in relation to its parts. Comte, as has been heretofore exhibited, degraded Science from its _Exact_ and _Certain_ position, in order to include Domains of Inquiry which did not have and to which he could not furnish a truly scientific basis. In like manner, after discarding a false Philosophy, unable to institute a true, or at least a sufficiently comprehensive one, on the foundation which he had reared, he gave the name of _Positive Philosophy_ to his incongruous coordination of Scientific and Unscientific Departments of Thought. The terms _Science_ and _Philosophy_, thus wrenched from their legitimate uses, are therefore loosely understood and indiscriminately applied by the students of his System and the followers of his social theories, in ways which are productive of numerous misunderstandings, though not perhaps of unprofitable criticisms. In a subsequent letter, the same gentleman calls attention to another supposed error--the omission of _La Morale_ from the Positive Hierarchy of Sciences--and adds: 'Although this final Science was in a manner involved in Sociology as treated in the _Philosophy_, its normal separation was yet a step of Capital Importance; sufficiently so to make the enumeration of Comte's Theoretical Hierarchy without it equivalent to a misrepresentation.'