274. Uernix, bernix, elasia: i.e. the gum of a tree that is cold and dry in the second degree; there are three sorts of it, a yellow sort, a foxy-red sort, and a white sort, and it is the clear, white sort that is the best of them; it has the virtue of binding and compacting all the colours, this being what painters put on their pictures after all the colours, because it brings out the true shade of every colour, and the colours are made clear and bright by it. If varnish, frankincense and white of hen-egg be put on the upper part of the stomach, it will stop any vomiting, The powder of this gum will stop any flux. If the same gum be rubbed on wax, it will retain its efficacy for a hundred years without corruption.