The work which Auguste Comte accomplished was immense. Its value can hardly be overestimated. Every modern Scientist and Thinker is largely indebted to him for that which is indispensable to high intellectual development and progress in thought. For the immense steps in Scientific advancement which he took; for his love of his Race; for his really religious spirit, exhibited in his utter devotion to that which he deemed the highest right; the love and sympathy of every student of Science and every devotee of truth is, and will be, forever his. That he failed in achieving a permanent Scientific basis of a sufficiently universal and unquestionable character--a real Universology, which should exhibit the essential verity of the _religious intuitions_ of the past, and should establish their inherent and harmonious connection with the unfolding _intellectual discoveries_ of the present--is true. But it should not be forgotten that every attempt, made in the right direction, which comes short of the final result, is but a stepping stone for the next effort, and, viewed as a single round in the great ladder of human ascension, a success--an element without which the final achievement would have been impossible. Without Comte there would have been no Buckle, whose work furnishes another of these steps. Every page of the 'History of Civilization' exhibits the indebtedness of the English Historian to the French Encyclopaedist of the Sciences; while the 'Intellectual Development of Europe' bears evidence of a 'Positivist' inspiration to which Professor Draper might have more completely yielded with decided benefit. For the lift which the author of the Positive Philosophy and the founder of the Positive Religion has given the world, let us be deeply grateful; although we must reject, as a finality, a System of Science which cannot _Demonstrate_ the correctness of its Principles and Phenomena, or a System of Religion which emasculates mankind of its diviner and more spiritual aspirations, and dwarfs him to the dimensions of a refined Materialism. In classifying our existing Knowledge, then, on our present basis of Scientific acquisition, we must draw a distinct line between Mathematics, Astronomy, and Physics, on the one side, and all remaining departments of Thought, on the other, and set these three Sciences apart as the Exact or Infallible ones, occupying a rank superior to the others, by virtue of the Certainty and Exactitude with which we are able, through the operation of the true Deductive Method, to ascertain their Principles and Phenomena. We shall then be enabled--by the aid of Comte's principle that the domains of investigation take rank in proportion to the complexity of their Phenomena--to ascertain, after a very brief examination, the place which History holds in the Scale, and how much claim it can lay to a Scientific character.