=Roman Weights.=--The standard was here the _libra_ or pound, which weighed 5,050 grains (being ·721 of the pound avoirdupois, which is equal to 7,000 grains), and was subdivided into 12 _unciae_ or ounces, the ounce again being divided into 24 _scripula_ or scruples. The Roman weights are here grouped according to multiples or divisions of the pound, and generally have their values marked upon them in dotted characters. Thus the pound is marked +I+, the half pound +S+(_emis_), and so on. The series, beginning at the bottom of Case 51, runs 10, 5, 4, 3, 2, 1-1/2, and 1 pounds. Fractions of the pound are 1/2lb. (semis) = 6 oz; 1/3lb. (triens) = 4 oz.; 1/4lb. (quadrans) = 3 oz.; 1/6lb. (sextans) = 2 oz.; and one ounce. Fractions of the ounce are 1/2oz. = 12 scruples; 1/3oz. = 8 scruples; 1/4oz. = 6 scruples; 1/8oz. = 3 scruples; 1/12oz. = 2 scruples; and one scruple. Some of the numerous dark stone weights have inscriptions, showing that they had been certified by proper authority. Thus one _libra_ (No. =472=) is inscribed: "On the authority of Q. Junius Rusticus, city-prefect" [167 A.D.]. In Sicily and Magna Graecia a weight called a _litra_ was used instead of the Roman pound, weighing rather less than the _libra_. A set of _litra_ weights in bronze, of late Imperial date, is shown in Case 41 (No. =473=). An ounce weight (marked [Illustration] in silver, and weighing 389 grains), belonging to this series, is seen in fig. 194 above. [Illustration: FIG. 195.--BRONZE WEIGHTS OF ARTISTIC FORM (NO. 400, etc.). 4:7.] [Illustration: FIG. 196.--ROMAN BRONZE STEELYARD (NO. 475). L. 12-3/4 in.]