It is, on the contrary, the real world, of which we have a true though very incomplete knowledge, over against a world of common experience which, as a complete whole, is not real, since it is compacted out of miscellaneous data, not all on the same level, by the help of the imagination.

There is no world corresponding to the world of our common experience.

Nature makes abstractions for us, deciding what range of vibrations we are to see and hear, what things we are to notice and remember.' I have cited these statements because both of them deal with topics which, though they lie outside the range of our discussion, are always being confused with it.

The reason is that they lie proximate to our field of thought, and are topics which are of burning interest to the metaphysically minded.

It is difficult for a philosopher to realise that anyone really is confining his discussion within the limits that I have set before you.