Düer himse1f connected his early studies in proportion with the names of Jacopo de' Barbari, the North Italian engraver, and the Roman writer, Vitruvius, whose famous work on architecture1 contains a passage about the proportions of a well-formed human figure.2 The nature of these connections and their relation to the effect of Gothic methods on Dürer's early constructed figures is one of the much discussed Dürer problems.3 The chief aim of this essay is to call attention to a constructed figure by Barbari, the Apollo of the engraving B. 16, K. 14, its connections with Dürer, and, further, its debt to Leonardo da Vinci.