Some weeks after, while walking at Emfras, a Mahometan village, whose inhabitants are myrrh merchants, I saw a large tree with the whole upper part of the trunk, and the large branches, so covered with bosses and knobs of gum, as to appear monstrously deformed, and inquiring farther about this tree, I found that it had been brought, many years before, from the myrrh country, by merchants, and planted there for the sake of its gum, with which these Mahometans stiffened the blue Surat cloths they got damaged from Mocha, to trade in with the Galla and Abyssinians. Neither the origin of the tree which they called Sassa, nor the gum, could allow me to doubt a moment that it was the same as what had been brought to me from the myrrh country, but I had the additional satisfaction to find the tree all covered over with beautiful crimson flowers of a very extraordinary and strange construction. I began then a drawing anew, with all that satisfaction known only to those who have been conversant in such discoveries.
Sassa
London Publish’d Dec.r 1.st 1789 by G. Robinson & Co.
Sassa
London Publish’d Dec.r 1.st 1789 by G. Robinson & Co.
I took pieces of the gum with me; it is very light. Galen complains that, in his time, the myrrh was often mixed with a drug which he calls Opocalpasum, by a Greek name, but what the drug was is totally unknown to us at this day, as nothing similar to the Greek name is found in the language of the country. But as the only view of the savage, in mixing another gum with his myrrh, must have been to increase the quantity, and as the great plenty in which this gum is produced, and its colour, make it very proper for this use, and above all, as there is no reason to think there is another gum-bearing tree of equal qualities in the country where the myrrh grows, it seems to me next to a proof, that this must have been the opocalpasum of Galen.
I must however confess, that Galen says the opocalpasum was so far from being an innocent drug, that it was a mortal poison, and had produced very fatal effects. But as those Troglodytes, though now more ignorant than formerly, are still well acquainted with the properties of their herbs and trees, it is not possible that the savage, desiring to increase his sales, would mix them with a poison that must needs diminish them. And we may therefore without scruple suppose that Galen was mistaken in the quality ascribed to this drug, and that he might have imagined, from tenderness to the profession, that people died of the opocalpasum who perhaps really died of the physician: First, Because we know of no gum or resin that is a mortal poison: Secondly, Because, from the construction of its parts, gum could not have the activity which violent poison has; and considering the small quantities in which myrrh is taken, and the opocalpasum could have been but in an inconsiderable proportion to the myrrh, to have killed, it must have been a very active poison indeed: Thirdly, these accidents from a known cause must have brought myrrh into disuse, as certainly as the Spaniards mixing arsenic with bark would banish that drug when we saw people die of it. Now this never was the case, it maintained its character among the Greeks and the Arabs, and so down to our days; and a modern physician, Van Helmont, thinks it might make man immortal if it could be rendered perfectly soluble in the human body. Galen then was mistaken as to the poisonous quality of the opocalpasum. The Greek physician knew little of the Natural History of Arabia, less still of that of Abyssinia, and we who have followed them know nothing of either.
This gum being put into water, swells and turns white, and loses all its glue; it very much resembles gum adragant in quality, and may be eaten safely. This specimen came from the Troglodyte country in the year 1771. The Sassa, the tree which produces the opocalpasum, does not grow in Arabia. Arabian myrrh is easily known from Abyssinian by the following method: Take a handful of the smallest pieces found at the bottom of the basket where the myrrh was packed, and throw them into a plate, and just cover them with water a little warm, the myrrh will remain for some time without visible alteration, for it dissolves slowly, but the gum will swell to five times its original size, and appear so many white spots amidst the myrrh.