That vomiting is of most service which consists of phlegm and bile
mixed together, and neither very thick nor in great quantity; but
those vomitings which are more unmixed are worse. But if that which
is vomited be of the color of leeks or livid, or black, whatever of
these colors it be, it is to be reckoned bad; but if the same man
vomit all these colors, it is to be reckoned a very fatal symptom.
But of all the vomitings, the livid indicates the danger of death,
provided it be of a fetid smell. But all the smells which are somewhat
putrid and fetid, are bad in all vomitings.