Apollodorus Library 1.5

[1]
  Pluto fell in love with Persephone and with the help of Zeus carried her off secretly. ¹ But Demeter went about seeking her all over the earth with torches by night and day, and learning from the people of Hermion that Pluto had carried her off, ² she was wroth with the gods and quitted heaven, and came in the likeness of a woman to Eleusis. And first she sat down on the rock which has been named Laughless after her, beside what is called the Well of the Fair Dances ³ ; thereupon she made her way to Celeus, who at that time reigned over the Eleusinians. Some women were in the house, and when they bade her sit down beside them, a certain old crone, Iambe, joked the goddess and made her smile. ⁴ For that reason they say that the women break jests at the Thesmophoria. ⁵
  But Metanira, wife of Celeus, had a child and Demeter received it to nurse, and wishing to make it immortal she set the babe of nights on the fire and stripped off its mortal flesh. But as Demophon — for that was the child's name— grew marvelously by day, Praxithea watched, and discovering him buried in the fire she cried out; wherefore the babe was consumed by the fire and the goddess revealed herself. ⁶

[2] But for Triptolemus, the elder of Metanira's children, she made a chariot of winged dragons, and gave him wheat, with which, wafted through the sky, he sowed the whole inhabited earth. ⁷ But Panyasis affirms that Triptolemus was a son of Eleusis, for he says that Demeter came to him. Pherecydes, however, says that he was a son of Ocean and Earth. ⁸

[3]
  But when Zeus ordered Pluto to send up the Maid, Pluto gave her a seed of a pomegranate to eat, in order that she might not tarry long with her mother. ⁹ Not foreseeing the consequence, she swallowed it; and because Ascalaphus, son of Acheron and Gorgyra, bore witness against her, Demeter laid a heavy rock on him in Hades. ¹⁰ But Persephone was compelled to remain a third of every year with Pluto and the rest of the time with the gods. ¹¹