Plenal

The greatest thing, necessarily including all other things, however plenal within itself, could not but be empty in respect to their fulness.

If the orang dentition (see fig. 9) be taken as representing a mean or plenal degree of development, then the gorilla's represents a supra-plenal phase, and the chimpanzee's the infra-plenal phase.

One physical advantage which Russell claims for the plenal theory, though again without full conviction, is a solution to the antinomy of absolute motion:

There is thus a relative motion between the earth and the plenal fluid touching it.