If particles of dust enter the eye, they can generally be removed by bathing it in cold water, or turning the head on one side, gently opening the lids and dropping three or four drops of water into the outer canthus. The water flows inward over the eyes and washes out the particles. If the matter is not removed in this way, raise the lid, gently bringing it forward over the other, at the same ti me looking towards the nose. If a hard particle should become imbedded in the membranes of the eye, a silk handkerchief or the point of a needle may be used to remove it. The inflammation caused by the irritation may be removed by washing the eye in cold water or with a mixture, composed of six drops of Arnica to a cup of water.