Is Philosophy possible as a science, and what are its conditions?--Giordano Bruno--Literary Aristocracy, or the existence of a tacit compact among the learned as a privileged order--The Author’s obligations to the Mystics--to Immanuel Kant--The difference between the letter and the spirit of Kant’s writings, and a vindication of prudence in the teaching of Philosophy--Fichte’s attempt to complete the Critical system--Its partial success and ultimate failure--Obligations to Schelling; and among English writers to Saumarez. After I had successively studied in the schools of Locke, Berkeley, Leibnitz, and Hartley, and could find in none of them an abiding place for my reason, I began to ask myself; is a system of philosophy; as different from mere history and historic classification, possible? If possible, what are its necessary conditions? I was for a while disposed to answer the first question in the negative, and to admit that the sole practicable employment for the human mind was to observe, to collect, and to classify. But I soon felt, that human nature itself fought up against this wilful resignation of intellect; and as soon did I find, that the scheme, taken with all its consequences and cleared of all inconsistencies, was not less impracticable than contranatural. Assume in its full extent the position, nihil in intellectu quod non prius in sensu, assume it without Leibnitz’s qualifying praeter ipsum intellectum, and in the same sense, in which the position was understood by Hartley and Condillac: and then what Hume had demonstratively deduced from this concession concerning cause and effect, will apply with equal and crushing force to all the other eleven categorical forms [27], and the logical functions corresponding to them. How can we make bricks without straw;--or build without cement? We learn all things indeed by occasion of experience; but the very facts so learned force us inward on the antecedents, that must be presupposed in order to render experience itself possible. The first book of Locke’s Essay, (if the supposed error, which it labours to subvert, be not a mere thing of straw, an absurdity which, no man ever did, or indeed ever could, believe,) is formed on a sophisma heterozaetaeseos, and involves the old mistake of Cum hoc: ergo, propter hoc.