The Life Carriers of a planetary corps are given a certain period in which to establish life on a new world, approximately one-half million years of the time of that planet. At the termination of this period, indicated by certain developmental attainments of the planetary life, they cease implantation efforts, and they may not subsequently add anything new or supplemental to the life of that planet.

During the ages intervening between life establishment and the emergence of human creatures of moral status, the Life Carriers are permitted to manipulate the life environment and otherwise favorably directionize the course of biologic evolution. And this they do for long periods of time.

When the Life Carriers operating on a new world have once succeeded in producing a being with will, with the power of moral decision and spiritual choice, then and there their work terminates—they are through; they may manipulate the evolving life no further. From this point forward the evolution of living things must proceed in accordance with the endowment of the inherent nature and tendencies which have already been imparted to, and established in, the planetary life formulas and patterns. The Life Carriers are not permitted to experiment or to interfere with will; they are not allowed to dominate or arbitrarily influence moral creatures.

Upon the arrival of a Planetary Prince they prepare to leave, though two of the senior carriers and twelve custodians may volunteer, by taking temporary renunciation vows, to remain indefinitely on the planet as advisers in the matter of the further development and conservation of the life plasm. Two such Sons and their twelve associates are now serving on Urantia.

In every local system of inhabited worlds throughout Nebadon there is a single sphere whereon the Melchizedeks have functioned as life carriers. These abodes are known as the system midsonite worlds, and on each of them a materially modified Melchizedek Son has mated with a selected Daughter of the material order of sonship. The Mother Eves of such midsonite worlds are dispatched from the system headquarters of jurisdiction, having been chosen by the designated Melchizedek life carrier from among the numerous volunteers who respond to the call of the System Sovereign addressed to the Material Daughters of his sphere.

The progeny of a Melchizedek life carrier and a Material Daughter are known as midsoniters. The Melchizedek father of such a race of supernal creatures eventually leaves the planet of his unique life function, and the Mother Eve of this special order of universe beings also departs upon the appearance of the seventh generation of planetary offspring. The direction of such a world then devolves upon her eldest son.

The midsonite creatures live and function as reproducing beings on their magnificent worlds until they are one thousand standard years of age; whereupon they are translated by seraphic transport. Midsoniters are nonreproducing beings thereafter because the technique of dematerialization which they pass through in preparation for enseraphiming forever deprives them of reproductive prerogatives.

The present status of these beings can hardly be reckoned as either mortal or immortal, neither can they be definitely classified as human or divine. These