Under this head we may speak of the vases called _murrhina_, since one theory respecting them is, that they were made of variegated glass. Their nature, however, is doubtful; not so their value. Pliny speaks of 70 talents being given for one holding three sextarii, about four and a half pints. Titus Petronius on his death-bed defrauded the avarice of Nero, who had compelled him, by a common piece of tyranny, to appoint the crown his heir by breaking a murrhine trulla, or flat bowl, worth 300 talents. Nero himself, as became a prince, outdid all by giving 100 talents for a single capis, or drinking-cup, "a memorable circumstance, that an emperor, and father of his country, should have drunk at so dear a rate." Pliny's description of this substance runs thus: "It is to be noticed that we have these rich cassidoin vessels (called in Latin murrhina) from the East, and that from places otherwise not greatly renowned, but most within the kingdom of Parthia; howbeit the principal come from Carmania. The stone whereof these vessels are made is thought to be a certain humor, thickened as it were in the earth by heat. In no place are these stones found larger than small tablements of pillars or the like, and seldom were they so thick as to serve for such a drinking-cup as I have spoken of already. Resplendent are they in some sort, but it may rather be termed a gloss than a radiant and transparent clearness; but that which maketh them so much esteemed is the variety of colors, for in these stones a man shall perceive certain veins or spots, which, as they be turned about, resemble divers colors, inclining partly to purple and partly to white: he shall see them also of a third color composed of them both, resembling the flame of fire. Thus they pass from one to another as a man holdeth them, insomuch as their purple seemeth near akin to white, and their milky white to bear as much on the purple. Some esteem those cassidoin or murrhine stones, the richest, which present as it were certain reverberations of certain colors meeting altogether about their edges and extremities, such as we observe in rainbows; others are delighted with certain fatty spots appearing in them; and no account is made of them which show either pale or transparent in any part of them, for these be reckoned great faults and blemishes; in like manner if there be seen in the cassidoin any spots like corns of salts or warts, for then are they considered apt to split. Finally, the cassidoin stones are commended in some sort also for the smell that they do yield."