The passage from the physics of the brain to the corresponding facts of consciousness is unthinkable. Granted that a definite thought and a definite molecular action in the brain occur simultaneously, we do not possess the intellectual organ, nor apparently any rudiments of an organ, which would enable us to pass by a process of reasoning from one to the other. They appear together, but we do not know why. Were our minds and senses so expanded as to enable us to see and feel the very molecules of the brain, were we capable of following all their motions, all their groupings and electrical discharges, if such there be, and were we intimately acquainted with the corresponding states of thought and feeling, we should be as far as ever from the solution of the problem--"How are these physical processes connected with the facts of consciousness?" The chasm between the two classes remains still intellectually impassable. With these views Professor Huxley[173] expresses his agreement, and although he contrives to confuse the issue very considerably, as is not unusual when he undertakes to philosophize, he lays down in the clearest possible terms that nothing whatever is _known_ as to the connexion of mechanical processes with thought, whence it follows that on this point Science has nothing to tell us. "I really know nothing whatever [he writes] and never hope to know anything, of the steps by which the passage from molecular movement to states of consciousness is effected." It should be needless to repeat that if nothing is known regarding all this, it is mere charlatanism to pretend that Science tells us anything about it, and those who make such assertions use words to which no meaning can attach. Unfortunately such a practice is far from uncommon in connexion with these questions. What sense can there be conceivable in the well-known materialistic doctrine that the brain secretes thought, just as the proper organs secrete bile or saliva? Bile and saliva are material substances, with a definite chemical constitution, each adapted to one definite function. But, Thought! It would be as intelligible to talk of secreting the British Constitution, the Steam Engine, and the Differential Calculus.