part of each hypothesis, will scarce find his reason able to determine him fixedly for or against the soul's materiality. Since on which side soever he views it, either as an unextended substance or as a thinking extended matter, the difficulty to conceive either will, whilst either alone is in his thoughts, still drive him to the contrary side. An unfair way which some men take with themselves, who, because of the inconceivableness of something they find in one, throw themselves violently into the contrary hypothesis, though altogether as unintelligible to an unbiassed understanding." This passage, I do not hesitate to say, is one of the most remarkable in the whole range of philosophical literature, in respect of showing how even the strongest and most candid intellect may have its reasoning faculty impaired by the force of a preformed conviction. Here we have a mind of unsurpassed penetration and candour, which has left us side by side two parallel trains of reasoning. In the one, the object is to show that the author's preformed conviction as to the being of a God is justifiable on grounds of reason; in the other, the object is to show that, granting the existence of a God, and it is not impossible that he may have endowed matter with the faculty of thinking. Now, in the former train of reasoning, the whole proof rests entirely upon the fact that "it is impossible to conceive that ever bare incogitative matter should produce a thinking intelligent being." Clearly, if this proposition is true, it must destroy one or other of the trains of reasoning; for it is common to them both, and in one of them it is made the sole ground for concluding that matter cannot think, while in the other it is made compatible with the supposition that matter may think. This extraordinary inconsistency no doubt arose from the fact that the author was antecedently persuaded of the existence of an _Omnipotent_ Mind, and having been long accustomed in his intellectual symbols to regard it presumptuous in him to impose any limitations on this almighty power, when he asked himself whether it would be possible for this almighty power, if it so willed, to endow matter with the faculty of thinking, he argued that it might be possible, notwithstanding his being unable to conceive the possibility. But when he banished from his mind the idea of this personal and almighty power, and with that idea banished all its associations, he then felt that he had a right to argue more freely, and forthwith made his conceptive faculty a test of abstract possibility. Yet _the sum total of abstract possibility, in relation to him, must have been the same in the two cases_; so that in whichever of the two trains of reasoning his argument was sound, in the other it must certainly have been null.