Fill a large glazed earthen jar with rose leaves, carefully separated from the cups; pour upon them spring water just sufficient to cover them, and set the jar, with its contents, in the sun for two or three days, taking it under cover at night; at the end of the third or fourth day small particles of yellow oil will be seen floating on the surface of the water, and which, in the course of a week, will have increased to a thin scum. This scum is the attar of roses. Take it up with a little cotton tied to the end of a stick, and squeeze it into a vial.