Described by the museum as an “exceptional discovery,” two drawings — of a horse’s head and half a skull — were found when the painting was sent to a laboratory for a routine re-examination. Bruno Mottin , the curator who conducted the analysis, told the newspaper Libération. Though the style of the drawings resembles Leonardo’s, the museum said further research was needed. A version of this article appeared in print on December 19, 2008, on page C2 of the New York edition.

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