The soul has, as we have seen, a general power of adapting itself to its environment, of permeating it, of feeling its way through it, of getting to understand it, of dealing with it at last with skill and success.

As is the particular environment, so is the subtle, tactful, adaptive, directly perceptive, subconsciously cognitive faculty,--the "sense," as I have called it--by means of which the soul acquires the particular knowledge that it needs.

The more highly specialised (whether by subdivision or by abstraction) the environment, the more highly specialised the sense.

The larger and more comprehensive the environment, the larger and more "massive" the sense.

The acquired aptitude which enables an omnibus driver to steer his bulky vehicle through the traffic of London is a highly specialised sense.