“In the third round the first-class Pitri becomes definitely human in form; though the body is jelly-like and gigantic, it is yet, on globe D, compact enough to begin to stand upright; he is ape-like and is covered with hairy bristles. The third-class Pitris reach the incipient human stage.
Second-class solar Pitris make their first appearance on globe D in this round, and take the lead in human evolution.
The archetypal forms of animals are brought down to be elaborated into perfection by the end of the sixth round, and “water” is the characteristic “element”.
The fourth round, the middle one of the seven that make up the terrene manvantara, is distinguished by bringing to globe A the archetypal forms of humanity, this round being as distinctively human as its predecessors were respectively animal, vegetable, and mineral.
Not till the seventh round will these forms be all fully realized by humanity, but the possibilities of the human form are manifested in archetypes in the fourth. “Earth” is the “element” of this round, the densest, the most material.
The first-class solar Pitris may be said to hover round globe D more or less in this round during its early stages of activity, but they do not definitely incarnate until after the third great outpouring of life from the planetary Logos in the middle of the third race, and then only slowly, the number increasing as the race progresses, and multitudes incarnating in the early fourth race.”
Annie Besant
The Mark Of God: Understanding Your "I AM Presence" 