An anonymous U.S. collector has bought Claude Monet\'s 1905 \"Nympheas\" for $43.8 million at a New York auction, Christie\'s said. The Wall Street Journal reported the work from Monet\'s water-lilies series was sold by the Hackley School in Tarrytown, N.Y., which received the painting as a donation from the family of the late investment banker Herb Allen. The work was sold Wednesday as part of Christie\'s Impressionist and modern art sale.