The _Psoricum_ was a mixture of cadmia and chalcitis, according to Dioscorides, Pliny, and Celsus;[536] or of litharge and chalcitis, according to Galen, Aetius, and Paulus Ægineta.[537] This metallic compound derived its name of _Psoricum_ from its supposed utility in the treatment of parts affected with the eruption of scabies or _psora_. The eyelids, according to the ancient oculists, were the occasional seat of eruptive or pruriginous inflammation (_psorophthalmia_, _scabrities_, _prurigo_, etc.) In enumerating the diseases of the lining membrane of the palpebræ, Galen mentions, among others, _sycosis_, _chalazosis_, and _psoriasis_.[538] Various collyria employed for the removal of these affections were termed _Psorica_, and most of them, though not all, contained the metallic compound alluded to. “Quae scabros in palpebris affectus persanant, atque ob id _Psorica_ appellantur.”[539] When speaking of the specific affections of the eyes and their appropriate local applications, Actuarius, in the same way, remarks, “Quae scabiosis palpebrarum affectionibus medentur, id circo _Psorica_ appellantur.”[540] He gives (p. 307) formulæ for various forms of the _Collyrium Psoricum_; as the _Psoricum aridum_, the _Psoricum Aelii_, etc. Aetius recommends the collyrium _Psoricum_ against “scabros ac corrosos angulos, et intensos pruritus, milphoses et prurigines.”[541] Scribonius Largus describes the composition of a collyrium _Psoricum_ made from the metallic compound of the same name (facit hoc collyrium bene quod _psoricum_ dicitur), and fitted to remove blindness, granulations, and xero-ophthalmia.[542] Marcellus Empiricus credulously invests the collyrium _Psoricum_ with signal powers for various eye-diseases, but particularly for old-standing blindness (antiquam coecitatem). For if (says he) we may credit the experience of the author of the remedy, it has, at the end of twenty days, restored sight to a person who had been blind for twelve years (nam ut auctori hujus remedii de experimento credamus, duodecim annorum coeco intra dies viginti visum restituisse se dicit).[543] On the Jena medicine-stamp the _Diapsoricum Opobalsamatum_ is entered as efficacious for the clearing of the sight (ad claritatem);[544] and in the proposed restoration of the reading of the present English stamp, I have added to it the same therapeutic indication, as one not unlikely to have originally filled up the part that is now deficient in this line of the stamp. 2. _L. Jul. Ivenis Di_ASMYRNES BIS _Lippitudinis i_MPETU EX OVO.—_The myrrh collyrium of L. J. Ivenis, to be used twice a day, mixed with an egg, at the commencement of Ophthalmy._ Already we have considered the composition, etc., of the Collyrium _Diasmyrnes_ (see pp. 267, 268.) It is entered, as efficacious in attacks of Lippitudo, on the medicine-stamps of Jena, Nais, etc. In the Jena stamp it is, as in the present instance, ordered to be used mixed with an egg.[545]