or CAIUS, a celebrated Roman jurist in the time of Antoninus Pius and Marcus Aurelius. Great use was made of his voluminous works in the compilation of the Digest. His Institutes, an elementary treatise on Roman law, was one of his most celebrated works. This work was long the ordinary text-book for those beginning the study of Roman law; but after the compilation of the Institutes of Justinian, it fell into disuse, and was finally lost. In 1816, however, this long-lost and valuable work was discovered by Niebuhr in the library of the chapter at Verona. The MS. containing "Gaius" was a palimpsest, with the new writing, in general, directly over the old. The Institutes of Gaius are composed in a terse, clear style, and seldom fail of pure Latinity.