401); Haly Abbas (Pract. ii, 46, 487); Ebn Baithar (i, 187.) Rhases marks what it is: “Nitrum appellatur Arabicè natrum et est simile sali gemmæ.” (Cont. l. ult. ii, 508.) They used it externally for the cure of prurigo and scabies, and as an application to diseased joints, and along with figs to remove dropsical swellings. They recommend an injection of it into the ear for the cure of deafness. The aphronitrum, or African nitrum, is said by Avicenna to be possessed of emetic powers, and that it was more incisive of gross humours than the other varieties of it. It was used by them in cases of poisoning with mushrooms, cantharides, and bull’s blood; and as an application to the bites of mad dogs. Mesue, with his wonted precision, states its powers very distinctly, recommending it, when given by the mouth, in clysters, and in suppositories as an evacuant of crude and viscid phlegm, for colic and affections of the stomach. Like Avicenna, he says that it will sometimes occasion vomiting. His commentator, Costa, has many ingenious observations on the ancient nitrum, which will be found very interesting to those who desire to become better acquainted with this subject. Haly Abbas states that friction with it before the hour of invasion will prevent an attack of ague. Λόγχιτις, Lonchitis, _Rough Spleenwort_; the root of that species which has triangular seed, like a spear, resembles that of the carrot, and is diuretic. But the green leaves of that species which resembles the scolopendrium, are agglutinative of wounds; and when dried, and drunk with vinegar, they cure indurated spleens. * * * * * COMMENTARY. Our author’s account of the two species of _Lonchitis_ is taken from Dioscorides. Of these, the former, which has been conjectured to be the _Serapias Lingua_, he says is diuretic. The other, which would seem to be the species of _aspidium_, to which the name is still appropriated, he calls vulnerary and anti-inflammatory, and recommends for reducing the size of the spleen. Galen and the other authorities give a similar account of it. Such of the Arabians as treat of it follow Dioscorides. See Avicenna (ii, 2, 336.) Λύκοψις, Lycopsis, _Hound’s-tongue_; having an astringent root, Dioscorides says, that when applied with polenta in a cataplasm, it agrees with erysipelas, and that if rubbed in with oil it is sudorific. * * * * * COMMENTARY. It is either the _Echium Italicum_, L., or the _Lycopsis echioides_, L., probably the former. Our author, as he acknowledges, borrows from Dioscorides. Galen, Aëtius, and Oribasius, as well as Hippocrates and Celsus, do not treat of it at all. If the Arabians notice it, they do so under the head of _Anchusa_. Λύκιον,