The Avataras
77
he is the son of King Priyabratha. The fourth Manu is called Tamasa; and he is the brother of Uttama. The fifth Manu is called Raivata. He is the brother of Tamasa. The sixth Manu is also the brother of Tamasa. The sixth Manu is called Chaksus; and he is the son of Chaksu. The seventh Manu is called Baivasvata. He is the son of the Sungod, born of a different wife, whose name is Chakya. The ninth Manu is called Daksasavarni. He is the son of Baruna. The tenth Manu is called Brahmasavarni, and he is the son of Upsloka. Four other Manus are known as Rudrasavarni, Dharmasavarni, Indrasavarni, and Raichya. All are sons of Lord Shiva.
After finishing the description of the Manu incarnations, the Lord described to Sanatan Goswami the  Yuga  Avatars. He said that there are four Yugas, or millennia. The first Yuga is called Satya, the second is called Treta, the third is called Dvapara, and the fourth is called Kali. In each millennium the Lord takes different colors in different incarnations. In the Satya Yuga the color of the principal incarnation is white. In the Treta Yuga the color of the principal incarnation is red, and in the Dvapara Yuga the color of the principal incarnation is blackish—Krishna. And, in the Kali Yuga, the color of the principal incarnation is yellow. This is confirmed in the  Srimad Bhagwatam , Tenth Canto, Eighth Chapter, as spoken by Gargamuni while calculating the horoscope of Krishna in the house of Nanda Maharaj.
In the Satya Yuga the process of self-realization is meditation, and this process of meditation was taught by the incarnation of God in the color of whiteness. This incarnation gave benediction to the sage Kardum for obtaining, as his son, an incarnation of the Personality of Godhead. In the Satya Yuga everyone meditates on Krishna, and each and every living entity is in full knowledge. Other meditations, which are not recommended in this present age, are still being attempted as meditational processes by people who are not in full knowledge.
The process for self-realization in the Treta millennium is performance of different sacrifices, and this is taught by the incarnation of God in His red color. In the Dvapara millennium, Krishna is Personally present, and He is worshipped by everyone, and that is the process of self-realization for that age. Krishna is blackish in color, He is the incarnation Himself, and He induces people to worship Him, as is stated in the Bhagavad Gita. The  Srimad Bhagwatam  also, in the Eleventh Canto, Fifth Chapter, states that the worship of Krishna is made by the hymn: "Let me offer my obeisances unto the Supreme Personality of Godhead, Vasudeva." This is the hymn generally practiced by the people to worship the Supreme Lord Krishna in the Dvapara millennium.
The next millennium is Kali Yuga, in which we are now. In this age the