This being so, what is to prevent us from believing that, once certain adjustments are made in the mental sausage-machine, we shall discover that what we once found impossibly tough meat will pass smoothly through and become done up into the most satisfactory of sausages? In other words, that the values are there if we choose to make them--an Euckenish doctrine which, for all that it arouses instinctive suspicion, may none the less be true. But even when we have made all possible discounts of this kind, evolved the smoothest-running machinery, converted the raw and meaty material of being into every conceivable kind of tidy sausage, the fact remains that there are feats beyond the power of our machine--beyond its power because of the very quality of its being. We live at a certain rhythm in time, at a certain level of size and space; beyond certain limits, events in the outer world are not directly appreciable by the ordinary channels of sense, although a symbolic picture of them may be presented to us by the intellect. When we are listening to the organ, sometimes there come notes which are on the border-line between sound and feeling: their separate vibrations are distinguishable and pulse through us, and the more the vibrations are separable, the more they are felt as mechanical shocks, the less as sound. However, we know perfectly well that all sounds as a matter of fact depend on vibratory disturbance, and that it is only some peculiarity of the registering machinery, in ear or brain, which enables us to hear a note as continuous. Still more remarkable are the facts of vision. As I write I see the tulips in my garden, red against the green grass: the red is a continuous sensation; but the physicists appear to be justified in telling us that the eye is being bombarded every second with a series of waves, not the few hundred or thousand that give us sound, but the half-billion or so which conspire to illuminate our vision. With sound, we alter the frequency of the waves and we get a difference of tone which seems to be merely a difference of more or less: but alter the frequency of light-waves, and the whole quality of the sensation changes, as when I look from the tulips to the sky. The change of registering mechanism is here more profound than the change in outer event. Or again, to choose an example that depends more on size than rhythm, how very difficult it is to remember that the pressure of air on our bodies is not the uniform gentle embrace of some homogeneous substance, but the bombardment of an infinity of particles. The particles are not even all alike: some are of oxygen, others of nitrogen, of carbonic acid gas, of water vapour. They are not all travelling at uniform speeds; collisions are all the time occurring, and the molecules are continuously changing their rate of travel as they clash and bump.