But both inside and outside of the Universities and Academies the scientific spirit and acquisitions of the nineteenth century have most profoundly, and on the whole favorably, affected the development of its philosophy. In the wider meaning of the word, "science,"--the meaning, namely, in which science = _Wissenschaft_,--philosophy aims to be scientific; and science can never be indifferent to philosophy. In their common aim at a rational and unitary system of principles, which shall explain and give its due significance to the totality of human experience, science and philosophy can never remain long in antagonism; they ought never even temporarily to be divided in interests, or in the spirit which leads each generously to recognize the importance of the other. The early part of the last century was, indeed, too much under the influence of that almost exclusively speculative _Natur-philosophie_, of which Schelling and Hegel were the most prominent exponents. On the other hand, the conception of nature as a vast interconnected and unitary system of a rational order, unfolding itself in accordance with teleological principles,--however manifold and obscure,--is a noble conception and not destined to pass away. On the continent--at least in France, where it had attained its highest development--the scientific spirit was, at the close of the eighteenth century, on the whole opposed to systematization. The impulse to both science and philosophy during both the eighteenth and the nineteenth centuries, over the entire continent of Europe, was chiefly due to the epoch-making work of that greatest of all titles in the modern scientific development of the Western World, the _Principia_ of Newton. In mathematics and the physical sciences, during the early third or half of the last century, Great Britain also has a roll of distinguished names which compares most favorably with that of either France or Germany. But in England, France, and the United States, during the whole century, science has lacked the breadth and philosophic spirit which it had in Germany during the first three quarters of this period. During all that time the German man of science was, as a rule, a scholar, an investigator, a teacher, _and a philosopher_. Science and philosophy thrived better, however, in Scotland than elsewhere outside of Germany, so far as their relations in interdependence were concerned. Into the Scottish universities Playfair introduced some of the continental suggestions toward the end of the eighteenth century, so that there was less of exclusiveness and unfriendly rivalry between science and philosophy; and both profited thereby. In the United States, during the first half or more of the century, so dominant were the theological and practical interests and influences that there was little free development of either science or philosophy,--if we interpret the one as the equivalent of _Wissenschaft_ and understand the other in the