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A white blaze in the hair, for example, is a well-proved unit factor in man; the factor not only produces a white streak in the hair, but affects the pigmentation of the skin as well, usually resulting in one or more white spots on some part of the body.

We perceive one unit factor in nature; and this factor is that something is going on then—there.

It is this unit factor, retaining in itself the passage of nature, which is the primary concrete element discriminated in nature.

The Mendelians have emphasized the rôle of the unit factor in heredity, and the conservation of the unit factor as an entity through all the adventures of matings.