Let us speak now of the cold imposthumes, and of the four things of which they are formed, i.e. of phlegm, and melancholy, flatulence, and wateriness. In the imposthumes formed by phlegm, some are made of thin phlegm along with a little choler, of such are (the) pimples that grow in the night, and they are called ‘daughters of the night’.375 Others are formed of gross phlegm,376 such as neck boils, and imposthumes of the armpit, and the groin, and of this kind are warts. Of medium phlegmatic humour is formed a soft imposthume, without pain.377