There are six species of imposthumes in general366 according to the matter367 from which they are made, i.e. the four humours, wateriness and flatulence. From sanguine humour is formed the imposthume called phlegmon, i.e. great swelling;368 and so there is a difference between it and the imposthume formed from choler,369 for in that there is only a little swelling, and it is sharp without being broad. If therefore sanguine humour is strongest, phlegmon is its name, and if phlegm is strongest, a soft imposthume is generated there called zimia.370