To obtain a slow-burning incense, add cedar-wood powder or wood charcoal and nitre to gum olibamim. gum benzoin, and gum galbanum; the gums in this mixture are volatilised without burning, and disseminate their odour through the air. The following is given as a recite for incense. Sandal-wood powder, llb.; cascarilla bark powder. 1/2lb.; benzoin powder, 1/2 lb.; myrrh, 2 oz.; nitre. 2 oz.; and grain musk, 1/4dr. A portion of the benzoin might be replaced by ollbanum and galbanum, but this will not alter the odour very much. Storax can be added to such a mixture, and would be absorbed by the sandal-wood powder; it may also be absorbed in charcoal.