business of adjusting them to the thoughts by which they ought to be accompanied, he is right in doing so. But he deludes himself if he imagines that any conclusions he can arrive at, while he practises M. Comte's rule of _hygiene cerebrale_, can possibly be definitive. Neither is such a practice, in a hygienic point of view, free from the gravest dangers to the philosopher's own mind. When once he has persuaded himself that he can work out the final truth on any subject, exclusively from his own sources, he is apt to lose all measure or standard by which to be apprized when he is departing from common sense. Living only with his own thoughts, he gradually forgets the aspect they present to minds of a different mould from his own; he looks at his conclusions only from the point of view which suggested them, and from which they naturally appear perfect; and every consideration which from other points of view might present itself, either as an objection or as a necessary modification, is to him as if it did not exist. When his merits come to be recognised and appreciated, and especially if he obtains disciples, the intellectual infirmity soon becomes complicated with a moral one. The natural result of the position is a gigantic self-confidence, not to say self-conceit. That of M. Comte is colossal. Except here and there in an entirely self-taught thinker, who has no high standard with which to compare himself, we have met with nothing approaching to it. As his thoughts grew more extravagant, his self-confidence grew more outrageous. The height it ultimately attained must be seen, in his writings, to be believed.