Some of them were known under the names of the oculists who invented or employed them. Thus Galen gives recipes for the collyria of Asclepiades, of Philoxenis, of Capiton, of Zoilus, of Cassius, of Sosandrus, of Phaedrus, of Syneros, of Hermeius, of Erasistratus, of Marcus, of Antonius Musa; the collyrium of Sergius, the Babylonian oculist; the collyrium of Philip of Cæsarea; and many others.[441] Occasionally the appellation under which the collyria were known was derived from some of their more marked physical properties, as the “collyrium _Chloron_ appellatum,” from the green colour of the preparation; the _Cirrhon_, from its yellowish tint; _Euchron_, from its agreeable hue (a colore bono dictum); the collyrium _Cygnus_, from its white or swan-like hue;[442] the _Aromaticum_, from its pleasant odour; and so forth. One or other of the principal ingredients entering into its composition seems to have given the name under which other collyria were known, as the _Nardinum_, from its containing spikenard; the collyrium _Diasmyrnes_ (δια, with, and σμυρνα, myrrh), from its containing myrrh; the _Diarrhodon_, from its containing roses, etc. Occasionally the collyrium seems to have derived its name and fame from some great person whom it had been fortunate enough to benefit or to cure. Thus, for example, Galen gives a recipe for the collyrium which Phlorus used in the case of Antonia, the mother of Drusus; for the “_collyrium Harmatium_,” which King Ptolemy used, etc. One was termed _Achariston_, from its cheapness; and this collyrium repeatedly occurs on the oculist-seals. Another was termed _Atimeton_, from its supposed great value. But perhaps the most common mode of appellation was the use of some recommendatory name, advertising the supposed high qualities of the drug. Thus the old Greek and Roman authors give various species of the collyrium _Monohemeron_,—so named from its being alleged to effect a cure in a single day; others are designated the _Miraculum_, the _Mysterium_, the Nectar collyrium (_Nectarium_); the Royal (_Collyrium Basilicon_); the Royal Indian (_Collyrium Indicum Regale_); the gold-like (_Isochryson_); the divine (_Isotheon_), etc. etc. And lastly, a collyrium was often known under some high-sounding but unmeaning name, such as the collyrium _Olympus_, _Proteus_, _Phœnix_, _Phyon_, _Sphærion_, _Philadelphium_, etc. etc. Under such designations the principal collyria of the Roman oculists were known and used (like the one invented and boasted of by Galen) “per omnes gentes quibus imperant Romani;” and it is under such special appellations that we find these different collyria mentioned in the inscriptions engraved upon the old oculist-stamps, which have been turned up among the ruins of their ancient colonial stations.