The thing_ eludes all mental presentation.

_But_,' he adds, '_the production of consciousness by molecular motion is quite as unpresentable to the mental vision as the production of molecular motion by consciousness.

If I reject one result, I reject both.

I, however, reject neither, and thus stand in the presence of two Incomprehensibles, instead of one Incomprehensible._' Now what does all this mean?
There is one meaning of which the words are capable, which would make them perfectly clear and coherent; but that meaning, as we shall see presently, cannot possibly be Dr.Tyndall's.
They would be perfectly clear and coherent if he meant this by them--that the brain was a natural instrument, in the hands of a supernatural player; but that why the instrument should be able to be played upon, and how the player should be able to play upon it, were both matters on which he could throw no light.

But elsewhere he has told us expressly that he does not mean this.