“Lysistrate de Sicyone fut le premier à prendre en plâtre des moules de la figure humaine. Dans ces moules il coulait de la cire, puis il corrigeait ces masques de cire d’après la nature. De la sorte, il atteignit la ressemblance, tandis qu’avant lui on ne s’appliquait qu’à faire de belles têtes. Lysistrate imagina aussi de reproduire l’image des statues, procédé qui obtint une telle vogue, que depuis lors ni figure ni statue ne fut faite sans argile, et l’on soit en conclure que ce procédé est antérieur à la fonte du bronze.” If this translation be correct, there seems to be no doubt either that Pliny was mistaken, or that the ancients knew and practiced the modern art of casting in plaster. Is, then, this translation correct? It seems to us to be an utter misapprehension of the whole meaning of the passage. Pliny says nothing about moulding or casting, and thus to translate and amplify the words he does use is to assume the very facts in question. What he really says is literally as follows:— “Lysistratus of Sicyon, brother of Lysippus, of whom we have spoken, first of all expressed the image of a man in gypsum from the whole person [that is, made full-length portraits], and improved it with wax [or color, for, as we shall see, _cera_ means both] spread over the form. He first began to make likenesses, whereas before him the study was to make persons as beautiful as possible. He also invented expressing effigies from statues; and this practice so grew that no statues or signa [which were full-length figures either painted, modeled, cast in bronze, or executed in marble] were made without white clay. From which it would seem that this science [or process] was older than that of casting in bronze. The most famous modelers were Damophilus and Gorgasus, who were also painters, and who decorated the temple of Ceres at Rome with both branches of their art.” The first sentence, thus literally rendered, it will be perceived, has in many respects the same ambiguity in English as in Latin. The words “image,” “expression,” and “form” have all a double signification, and the question is what is their true meaning in this connection. If it can be shown that this passage neither describes nor proposes to describe the process of casting in plaster, as we understand that phrase, the keystone of the whole argument that it was known to the ancients falls out. No other writer directly asserts that such a knowledge or practice existed, and all allusions to this matter contained in any ancient author are purely collateral, and have no force in themselves. Further, some well-known facts which we shall have occasion to bring forward later are entirely opposed to the probability of such a knowledge and practice.