2middle, for balance. The Prsthas are force and strength; verily they place force and strength in the middle. They proceed with the Brhat and the Rathantara (Samans). The Rathantara is this (earth), the Brhat yonder (sky); verily with them do they proceed; verily also in them they find support. These indeed are the quick paths of the sacrifice; verily by them do they proceed to the world of heaven [3]. They mount the world of heaven turning away (from earth), who perform the Prsthas in succession. The Tryaha is reversed, for the return (from heaven), and for support. Having prospered in either world they cease (the rite). These (nights) are fifteen. As for ten of them, the Viraj is ten-syllabled, the Viraj is food; verily by the Viraj they win food. As for five, the quarters are five; verily they find support in the quarters. There are Atiratras on either side, for securing power, strength, offspring, and cattle.