Eruptions on the skin are in many cases the outcome of constitutional ill-health; for example, the eczema of gout. Also where the whole body is infected, as in syphilis, there are skin-eruptions, which may be pimples (lichenous) or scales, or rashes, or, as in the first great outburst of syphilis, “pustules” so general over the body that those who were casting about for the nosological affinities of the new malady, saw no better place for it than Avicenna’s group of alhumata, which included smallpox and measles. That a skin-eruption of the nature of smallpox should have come out as a constitutional manifestation, and that a number of persons should have exhibited it together for the same internal reason, are both credible suppositions, although necessarily unsupported by historic evidence. Let us suppose that the Abyssinian army before Mecca endured some ordinary discomfort of campaigning, that, in the uniformity of their life, numbers together had fallen into the same constitutional ill-health just as numbers together have often fallen into scurvy, and that an eruption of the skin, proper to the tropics, was part of it. What we have farther to suppose is that the constitutional eruption became catching from the skin outwards, so to speak,—that it could be detached from its antecedents in the body, and could exist as an autonomous thing, so that it would break out upon those who had none of its underlying constitutional conditions, but had been merely in contact with such as had developed it constitutionally or from within. Such detachment of a constitutional eruption from its primary conditions is little more than constantly happens when a skin-disease like eczema, or acne, persists long after its provocation, or the disordered health which called it forth, is removed. The inveteracy or chronicity of some skin-diseases is itself a form of autonomy, but a form of it which does not transcend the individual, just as, among infections themselves, cancer does not transcend the individual or propagate itself by contagion[872]. But there exists a closer probable analogy for a secondary eruption becoming a self-existent or independent infective disease. The instance in view is no more than probable, and may easily be disputed by those who have sufficient prepossessions the other way; but there is no theory that suits so well the negro disease of yaws as that it is a somewhat peculiar secondary of syphilis, which is now able to be communicated as an exanthem detached from the primary lesions on which it had depended originally for its existence.
All the evidence, historical and geographical, points to the several varieties of the black skin (or yellow skin) as the native tissues of smallpox. It is not without significance that a disease of the negroes which was observed by English doctors not long ago in the mining districts of South Africa led to a sharp controversy whether it was smallpox or not: according to some, it was a constitutional eruption; according to others it was a contagious infection. Such phenomena are not likely to be seen in our latitudes; but the original smallpox itself was not a disease of the temperate zone[873].
I shall not carry farther this line of remark as to the probable circumstances in which a pustular eruption, among the Abyssinians before Mecca, or among other Africans or other dark-skinned races in other places and at other times, had become epidemically contagious in the familiar way of smallpox. One has to learn by experience that there is at present no hearing for such inquiries, because a certain dominant fashion in medicine prefers to relegate all those origins to the remotest parts of the earth and to the earliest ages (practically ab aeterno), and there to leave them with a complacent sense that they have been so disposed of. That is not the way in which the study of origins is carried out for all other matters of human interest. Yet diseases are recent as compared with the species of living things; some of them are recent even as compared with civilized societies. Epidemical and constitutional maladies touch at many points, and depend upon, the circumstances of time and locality, and upon racial or national characters. Perhaps their origins will one day be made a branch of historical or archaeological research.
European Smallpox in the Middle Ages.
The present extensive prevalence of smallpox among the Arabs may or may not date from the Elephant War of A.D. 569. Its prevalence also in Abyssinia, so widely in modern times that almost everyone bears the marks of it, may have no continuous history from the return of Abraha’s expedition. But the history of smallpox in the West comes to us through the Saracens, and there can be no question that the disease is at the present day peculiarly at home in all African countries, and most of all in the upper basin of the Nile, where, as Pruner says, “it appears as the one great sickness[874].” It is a remark of Freind, whose erudition and judgment should carry weight, that “the Saracens first brought in this distemper, and wherever their arms prevailed, this spread itself with the same fury in Africa, in Europe, and through the greatest part of Asia, the eastern part especially[875].” Our inquiry here does not extend beyond England, so that the extremely disputable question of the amount and frequency of smallpox in the European countries conquered or invaded by the Saracens in the Middle Ages need not be raised[876].
So far as concerns England, smallpox was first brought to it, not by the Saracen arms, but by Saracen pens. The earliest English treatise on medicine, the Rosa Anglica of Gaddesden, has the same chapter “De Variolis [et Morbillis]” as all the other medieval compends—in substance the same as in the earlier work of Gilbert, and in all the other Arabistic writings earlier or later. The Rosa Anglica was a success in its day, partly, no doubt, by reason of its style being more boisterous than that of Gilbert’s or Gordonio’s treatises, partly, also, on account of its blunt indecency in certain passages. Guy de Chauliac, of Avignon, one of the few original observers of the time, had heard of the Rosa Anglica, and was curious to see it; but he found in it “only the fables of Hispanus, of Gilbert, and of Theodoric,” and he rather unkindly fixed upon it the epithet of “fatuous.” What de Chauliac had probably heard of was Gaddesden’s occasional claims to originality; and these we shall now examine so far as they concern smallpox.
One of Gaddesden’s variations from the stock remarks on smallpox is his explanation of why the disease was called variola: it is called variola, says he, because it occurs in diverse parts of the skin (quia in cute diversas partes occupant). This is an ingenious improvement upon Gilbert, who says that it is called variola from the variety of colours (et dicitur variola a varietate coloris)—sometimes red, sometimes white, or yellow, or green, or violet, or black. Another remark attributed (by Häser at least) to Gaddesden as original, is that a person may have smallpox twice; but Gaddesden, in a later paragraph, shows where he got that from: “And thus says Avicenna (quarto Canonis), that sometimes a man has smallpox twice—once properly, and a second time improperly.” The most famous of Gaddesden’s originalities is his treatment by wrapping the patient in red cloth; for that also Häser ascribes to him. But Peter the Spaniard, the Hispanus of de Chauliac’s reference given above, is before him with the red-cloth treatment also, while he is candid enough to quote Gilbert: “Any cloth dyed in purple,” says Hispanus, “has the property of attracting the matter to the outside.”
Gilbert’s reference is as follows: “Old women in the country give burnt purple in the drink, for it has an occult property of curing smallpox. Let a cloth be taken, dyed de grano.” Bernard Gordonio, also, says: “Thereafter let the whole body be wrapped in red cloth.” There was probably Arabic authority for that widely diffused prescription, as for all the rest of the teaching about smallpox. But Gaddesden does improve upon his predecessors in boldly appealing to his own favourable experience of red cloth:—“Then let a red cloth be taken, and the variolous patient be wrapped in it completely, as I did with the son of the most noble king of England when he suffered those diseases (istos morbos); I made everything about his bed red, and it is a good cure, and I cured him in the end without marks of smallpox.”
With reference to this cure, it has to be said, in the first place, that the object of the red cloth was to draw the matter to the surface[877], and that it had nothing to do with the prevention of pitting. The means to prevent pitting was usually to open the pustules with a golden needle; that is the Arabian advice, and all the Arabists copy it. Gaddesden among the rest copies it, but he does not say that he practised it on the king’s son. If he had said so, we might have believed that the disease was actually one bearing pustules which could be opened by a needle. What he says, in the earliest printed text (Pavia, 1492) is that, while the king’s son was “suffering from those diseases,” he caused him to be wrapped in red cloth, and the bed to be hung with the same, and that he cured him without the marks of smallpox. Gaddesden was not altogether an honest practitioner; on the contrary he was an early specimen of the quack in excelsis. According to the learned and judicious Dr Freind, “his practice, I doubt, was not formed upon any extraordinary knowledge of his faculty;” and again, “He was, as it appears from his own writings, sagacious enough to see through the foibles of human nature; he could form a good judgment how far mankind could be imposed upon; and never failed to make his advantage of their credulity[878].” The opportunity of diagnosing variola in the king’s son, and of curing it by red cloth, so as to leave no pits, was one that such a person was not likely to let slip. “It is a good cure,” he says; and we may go so far with him as to admit that it must have been impressive to the royal household to have heard some sharp sickness of the nursery called by the formidable name of variola, and to have seen it cured “sine vestigiis.”