Ointments are spread on calicoes, lint, or even thin layers of tow, by means of a knife; they should not be spread too thick. Sometimes ointment is applied to discharging surfaces on a piece of linen, folded over on itself several times, and then cut at the corners with scissors, in order to make small holes in it. The matter discharged passes out freely through these holes, and is received in a layer of tow spread over the linen.