Sources are the main means in the north direction. Autumn originates from the source. Anushtup verses originated from Autumn. Edsam originated from Anushtup. Manthi was born from Adsam. Ekvinsh Stome originated from Manthi. Vairaj Sama was born from ekvinsh. The head of all this is Vishwamitra Rishi. With the cooperation taken from Prajapati, we accept the source for the subjects. (57)