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Sinking wood (Chenxiang) is found in all commanderies of Lingnan, especially in those prefectures near the sea. The trunks interlock and branches connect, with hills and ridges joining continuously for thousands of li without interruption. The leaves resemble those of Ilex aquifolium (Dongqing), and the larger ones require several people to embrace them. The wood has a void and soft nature; mountain dwellers sometimes use it to construct thatched huts, or to build bridges, or to make rice steamers (fan zeng), which is particularly excellent. Only one or two out of a hundred have fragrance. Fragrance forms only when the wood encounters water, mostly in broken branches or dead trunks, becoming either "sinking" (chen), "decoction" (jian), or "yellow ripe" (huang shu). Those that fall naturally from dead trees are called "water plate incense" (shui pan xiang). Currently, in Nan'en, Gao, and Dou prefectures, only fragrant sinking wood is produced. Mountain dwellers enter the mountains, see the curved trunks and slanting branches of fragrant trees, and must chop them into depressions with knives. After a year of being soaked by rainwater, the resin forms. They then saw it off, scrape away the white wood, and the fragrance condenses into spots, hence named "partridge spots" (zhegu ban); when burned, its scent is extremely clear and intense. The best quality sinking wood is found only in Qiongzhou and Yazhou, commonly known as "horn sinking" (jiao chen). Yellow sinking is obtained from dead wood and is suitable for medicinal use. That which forms attached to the bark is called "green cassia" (qing gui), with an exceptionally clear aroma. That which lies in the soil for many years and forms without needing to be chiseled out is called "dragon scales" (long lin). There are also pieces that curl up when shaved and feel tough and flexible when chewed, called "yellow wax sinking" (huang la chen), which is particularly rare. However, medical classics only mention its ability to treat wind-water toxic swelling and remove foul qi, with no other therapeutic indications recorded. Current physicians use it to preserve and protect Wei Qi (Defensive Qi), classifying it as a top-grade medicine, preferably ground to an extreme fineness. People often take it ground together with Xinyi (Linderae Radix) to disperse stagnant qi; used alone, its effect is weak, but when assisted by other herbs, it yields gradual benefits with no harm. No other herbs can compare with it.

Xunlu Incense (Hunlulu Xiang) has leaves resembling those of Pyrus betulaefolia (Tangli). It originates from the Acha Li Kingdom on the border of Southern India and is now called Western Incense (Xi Xiang). Those from southern foreign regions are better; this is what people today call Ru Xiang (Frankincense), because its dripping resembles milk. That which melts and collapses on the ground is called Ta Xiang (collapsed incense). They are essentially the same.

Ri Hua Zi stated: "It treats bad breath." This is precisely the incense held in the mouth by censors. It treats stomach coldness and disharmony caused by cold qi in the spleen and stomach. Among them, the larger variety is named Mu Dingxiang (Mother Clove), which has an even superior aroma. Ground into powder, sewn into a small gauze bag the size of a little finger, filled with the powder, and inserted into the vagina, it primarily treats vaginal coldness; treatment stops once the disease is cured.