3720. Others who insinuate themselves by affections, when they thence supposed that they were passing towards the region of the thorax, and thence into the loins, were brought, as I felt, through the external skin, and it was perceived that those of this quality took possession there of the little pools of fetid sweat; and how foul these are may be clearly perceived by means of microscopes; they are also the hiding places of lice. In like manner they insert themselves about the loins, and the issue is, that they dwell in the vilest filth.