But the dust they have raised is not impenetrable, and can, with a little patience, be laid altogether.
The phenomenon of consciousness is in one way unique.

It is the only phenomenon with which science comes in contact, of which the scientific imagination cannot form a coherent picture.

It has a side, it is true, that we can picture well enough--'_the thrilling of the nerves_,' as Dr.
Tyndall says, '_the discharging of the muscles, and all the subsequent changes of the organism_.' But of how these changes come to have another side, we can form no picture.

This, it is perfectly true, is a complete mystery.

And this mystery it is that our modern physicists seize on, and try to hide and lose in the shadow of it a conclusion which they admit that, in any other case, a rigorous logic would force on them.
The following is a typical example of the way in which they do this.