SECT. V.—ON LEUCE.
Leuce is a change of the skin to a white colour, occasioned by a viscid and glutinous phlegm. Since all the kinds of leuce are not curable, you may form a diagnosis of it in this manner. Pierce the leuce superficially, not deeper than the skin, with a needle, and if blood flow, the complaint may be cured; but if a milky moisture be discharged, it is incurable. Or, rub it with a rough woollen rag, and if the part become red, the complaint may be cured; but if it remain of the same colour, it cannot be cured. And those kinds which attack a great part of the body are to be supposed more difficult to cure than those which are confined to a small space, and old cases than recent. Some, therefore, in leuce, have approved of burning by iron, consisting simply of the application of heat. Others, dreading the pain of burning, and the scar arising from it, as being no less unseemly than leuce itself, have had recourse to escharotic medicines, such as they say will produce a scar of the natural colour. Others rejecting all these things on account of the difficulty of their application, have used dyes (paying more consideration to the deception than the utility which they produce,) which are, of all others, the most to be rejected, owing to the speedy renewal of the affection. We must use, then, the under-mentioned remedial powers: Of adarce, of rosemary seed, of sulphur vivum, of each, equal parts; bruise and strain singly, and then, having triturated together for a sufficient number of days, anoint in the sun, but not in great quantity, lest the skin be ulcerated; and, after some time, a little hellebore and galls may be added in like manner.—Another: Macerate the tops of the black fig in vinegar, and having triturated, mix equal parts of aphronitrum, sulphur vivum, and the fruit of tamarisk, and having rubbed natron into the part, anoint and expose to the sun, taking care lest an ulcer be produced. But Archigenes having mixed a sufficiency of quicklime with fig-leaves, used them in like manner: or, he says, having rubbed the leuce with white hellebore until the part perspire and become of the same colour as the rest of the body, anoint with sinopis or melian earth; or, having perforated them with needles until they bleed, anoint with sinopis in vinegar; or, having first rubbed them as formerly said, anoint with the fresh juice of figs, or rub in so much with the leaves of it.
Commentary. In [the second Section] we have stated so fully the nature of the leuce, and the difference between it and its cognate affections, that it will be unnecessary for us now to resume the subject. It is there mentioned that leuce is Celsus’ third species of vitiligo, and the baras of all the Arabian translators, with the exception of Stephanus Antiochensis, the translator of Haly Abbas, who applies the term lepra to it. It was therefore the white species of leprosy. All the medical authorities represent it as an intractable disease, not only the cuticle being altered in structure, but also the flesh below, and even the hairs, having undergone a change of colour. All direct us to prick the skin with a needle, and, if it bleed, the cure is to be attempted; but if a slight colourless fluid issue from it, the case is to be abandoned as hopeless. They consider it as arising from debility of the assimilative faculty of the part which can no longer convert the nutritive juices into their proper consistence. All recommend nearly the same treatment. The diet is to be regulated with a strict abstinence from gross food; if there be plethora, venesection is to be premised; then drastic purgatives and emetics are to be given, and the parts affected are to be rubbed with stimulant and caustic applications, containing hellebore, nitre, sulphur, misy, red arsenic, &c., or even the actual cautery may be applied. In short, all treat the disease in nearly the same manner as our author. (See in particular Serapion and Avicenna.)
Aristotle, we believe, is the first Greek writer who makes mention of leuce. He calls it a disease in which all the hairs of the body turn white. (Hist. Nat. iii, 11.)
“The snow-white leprosy” of the ancient Jews was the leuce of the Greeks. Moses describes very correctly the method of distinguishing it from the alphos and melas; (Leviticus, c. xiii.) The symptoms of leuce are given in the 3d verse; of the alphos in the 4th; of the melas in the 6th. He calls it contagious, which might lead us to suspect that elephantiasis was mixed up with the leprosy of the Jews. This opinion is further confirmed from what is mentioned by Josephus of its being said that his countrymen were driven out of Egypt because they were affected with leprosy. (See also Justin. xxxvi, 20, and Tacit. Hist. v, 3.) Now we know that elephantiasis was endemial in that country. (See chap. i.) The English translation of this chapter is very inaccurate, the translators having evidently failed to recognize the nice distinction between cognate diseases, laid down by the Jewish legislator.
Leuce is still common in tropical climates. Negroes affected with it are called Albinos. It is merely an aggravated variety of the Lepra vulgaris.