Here again is a conception at the base of visualisation and muscularisation; it consists in referring to the visual and other sensations, raised for the occasion to the dignity of external and permanent causes, the other sensations which are considered as the effects of the first named upon our organs of sense.
It demands a great effort to clear our minds of these familiar conceptions which, it is plain are nothing but naive realism.

Yes! the mechanical conception of the universe is nothing but naive realism.
To recapitulate our idea, and, to make it more plain by an illustration, here is a tuning-fork on the table before me.

With a vigorous stroke of the bow I set it vibrating.

The two prongs separate, oscillate rapidly, and a sound of a certain tone is heard.

I connect this tuning-fork, by means of electric wires, with a Deprez recording apparatus which records the vibrations on the blackened surface of a revolving cylinder; and we can thus, by an examination of the trace made under our eyes, ascertain all the details of the movement which animates it.