Chrysostom alludes to the common opinion that psora is a contagious disease. The poet Æschylus gives a short description of leprosy in his ‘Chöepheræ’ by the name of lichenes. (l. 277.) Celsus nowhere uses the terms lepra and psora, and therefore there is considerable difficulty in comparing his account of these cutaneous affections with the descriptions of the Greeks. Alphos, melas, and leuce, he describes very intelligibly, connecting them together by the generic term of vitiligo. We shall give his own characteristic description of these diseases:—“Ἄλφος vocatur ubi color albus est, fere subasper, et non continuus, et quædam quasi guttæ dispersæ esse videantur: interdum etiam latius, et cum quibusdum intermissionibus serpit. Μέλας colore ab hoc differt quia niger est et umbræ similis: cætera eadem sunt. Leuce habet quiddam simile alpho, sed magis albida est et altius descendit; in eâque albi pili sunt, et lanugini similes. Priora curationem non deficillimam recipiunt: ultimum vix unquam sanescit.” Another class of cutaneous affections he connects by the generic term of impetigo, and it is to be remarked that they are all squamous diseases, and not pustular, like the complaints to which Drs. Willan and Bateman have applied the term. His second species of impetigo (as Bateman remarks) appears to be the psora of the Greeks:—“Alterum genus pejus est, simile papulæ feræ, sed asperius rubicandiusque, figuras varias habens: squamulæ ex summâ cute discedunt, rosio major est, celerius et latius procedit, certioribusque etiam quam prior temporibus et fit et desinit. Rubra cognominatur.” His third species bears some resemblance to the lepra nigricans of Willan and Bateman:—“Tertia etiamnum deterior est: nam et crassior est et durior, et magis tumet, in summâ cute finditur, et vehementius rodit, _ipsa quoque squamosa sed nigra_, &c. Nigræ cognomen est.” His account of the fourth species seems to refer to the lepra vulgaris:—“Quartum genus est quod curationem omnino non recipit distans colore: nam sub-albidum est et recenti cicatrici simile: squamulas habet pallidas, quasdam subalbidas, quasdam lenticulæ similes: quibus demptis nonunquam profluit sanguis.” For all these diseases he recommends a composition containing sulphur, natron, and rosin. Scribonius Largus describes several compositions, “ad lepram, quæ quasi impetigo est cum prurigine cutis,” and for scabies. They contain sulphur, Æthiopian cumin, vinegar, frankincense. Serenus Samonicus makes mention of a few popular remedies for scabies, prurigo, and papulæ, but he gives no description of these complaints. Octavius Horatianus recommends for scabies (meaning, we suppose, the psora of the Greeks,) bleeding, purging, frequent baths, and external applications containing natron, frankincense, and sulphur. He does not mention lepra by name, nor does he seem to allude to it at all.