Let us speak now of the signs of this sickness. Avicenna says it is necessary where there is this disease, to find out whether it arise from an evil complexion along with matter, or without it; though it is rarely caused without matter, and without evil humours. If it be produced without matter, it
p.333will be accompanied by pain, but no heaviness or swelling, nor discoloration of the skin; and if caused by matter it is meet to look whether it be simple or composite. If it come from simple matter, then see whether it be caused by phlegm, or choler, or melancholy, or sanguine humour, or by flatulence.