51. Balsamum: i.e. it is the gum of a tree that grows in Babylon; it is hot and dry in the second degree; it serves well people with paralysis, and those with the other cold illnesses as well; if it be held in the mouth, it will warm the brain; of all aromatics, it smells best; the balsamum is good if it be pure and with a sub-yellow colour; if it be put in water, and if it be pure, the water will not be dirtied, but if the water be dirty, the contrary will be the case.