五杂俎∶出弱水西，形如雀卵，色颇淡白，焚之辟邪去秽，鬼魅避之。情物志载汉武帝
焚西使香，宫中病者尽起。徐审得鹰嘴香，焚之，一家独不疫疾，即此类欤。
辟邪去疫，安魂魄，定惊悸。
出交趾、真腊、占城、琼海等处。单斗南云∶此乃伽 香树中空腹内所结，借伽 芬烈
之气
，得日月雨露之精凝结而成，故名气结。形亦同香块，而酥润松腻，不甚坚大，约伽 得其
质，此得其魂，亦如天生黄出汤泉，为硫气熏结而成者，然颇难得，世不多见。
治噎隔用一、二厘，酒磨服下，咽即开。
查浦辑闻∶海南人采香，夜宿香林下，望某树有光，即以斧斫之，记其处，晓乃伐取，
必得
美香。又见光从某树飞交某树，乃雌雄相感，亦斧痕记取之，得飞沉香，功用更大。
此香能和阴阳二气，可升可降。外达皮毛，内入骨髓，益血明目，活络舒筋。
方舆志∶生黎居五指山，山在琼州山中，所产有沉香，青桂香、鸡骨香、马蹄栈香，同
是一
本，其本颇类椿及榉柳，叶似桔，花白，子若槟榔，大如桑椹，交州人谓之蜜香。欲取者先
断其积年老根，经岁皮干朽烂，而木心与枝节不坏者，即香也。坚黑沉水者为沉香，细枝坚
实不烂者为青桂，半沉半浮者为鸡骨，形如马蹄者为马蹄，粗者为栈香。
《五杂俎》记载：特迦香出产于弱水以西，形状像麻雀的蛋，颜色很淡白，焚烧它可以辟邪去秽，鬼魅会躲避它。《情物志》记载汉武帝焚烧西域使者进贡的香，宫中患病的人都痊愈了。徐审得到鹰嘴香，焚烧后，全家唯独没有染上瘟疫，这大概就是同一类香吧。（特迦香具有）辟邪去疫、安定魂魄、镇定惊悸的功效。
产自交趾、真腊、占城、琼海等地。单斗南说：这是伽香树中空部分结成的，借助伽香浓烈芬芳的气息，吸收日月雨露的精气凝结而成，所以叫作“气结”。形状也像香块，但酥润松腻，不太坚硬硕大，大约伽香取其质地，此香取其神韵，就像天然硫磺出自温泉，由硫气熏蒸凝结而成一样，然而很难得，世间不常见。治疗噎膈（吞咽困难），用一、二厘，用酒磨开服用，咽部随即通畅。
查浦辑闻记载：海南人采集沉香，夜晚宿营在香林下，看见某棵树有光，就用斧头砍它，记下位置，天亮才去砍伐，一定能得到好香。又看见光芒从某树飞向另一棵树，那是雌雄相互感应，也用斧痕标记并采集，得到飞沉香，功效更大。这种香能调和阴阳二气，可升可降。外达皮毛，内入骨髓，补血明目，活血通络舒筋。
《方舆志》记载：生黎族居住在五指山，山位于琼州山中，所产的有沉香、青桂香、鸡骨香、马蹄栈香，都同出一棵树，树干很像椿树和榉柳，叶子像橘子叶，花白色，果实像槟榔，大小如桑葚，交州人称之为蜜香。想要获取的人先切断其积年老根，经过一年树皮干枯朽烂，而木心和枝节不腐烂的，就是香。坚硬黑色沉入水中的是沉香，细枝坚实不腐烂的是青桂，半沉半浮的是鸡骨，形状像马蹄的是马蹄香，粗大的称为栈香。
*Wu Za Zu* records: It originates west of the Ruo River, shaped like a sparrow's egg, with a pale white color. Burning it expels evil and removes filth; ghosts and demons avoid it. *Qing Wu Zhi* records that Emperor Wu of Han burned incense presented by envoys from the Western Regions, and all patients in the palace recovered. Xu Shen obtained Yingzui Xiang (Eagle Beak Incense); after burning it, his family alone was spared from epidemic disease. This is likely the same type. [It has the functions of] expelling evil and preventing epidemics, calming the Hun and Po spirits, and stabilizing palpitations and fright.
It is produced in Jiaozhi, Zhenla, Zhancheng, Qionghai, and other places. Shan Dounan states: This forms within the hollows of the Qie Xiang tree (Aquilaria sinensis), condensing through the influence of the pungent fragrance of Qie Xiang and the essence of sun, moon, dew, and rain; hence it is named "Qi Jie" (Gas Knot). Its shape resembles incense blocks but is soft, moist, loose, and greasy, not particularly hard or large. Roughly speaking, Qie Xiang provides its substance, while this provides its spirit, similar to how natural sulfur forms from sulfur gas fumes in hot springs. However, it is rare and seldom seen in the world. For treating Yige (dysphagia/esophageal obstruction), use one or two li, grind with wine, and take orally; the throat will immediately open.
Cha Pu Jiwen records: People in Hainan collect incense by camping under incense forests at night. When they see light emanating from a certain tree, they chop it with an axe, mark the location, and harvest it at dawn, ensuring they obtain fine incense. They also observe light flying from one tree to another, indicating mutual attraction between male and female trees; they mark these with axe wounds to harvest Fei Chenxiang (Flying Agarwood), which has greater efficacy. This incense can harmonize Yin and Yang Qi, rising and descending as needed. It reaches the exterior skin and hair and penetrates the interior bone marrow; it benefits blood and brightens the eyes, activates collaterals, and relaxes tendons.
*Fang Yu Zhi* records: The Sheng Li people reside on Wuzhi Mountain, located in the mountains of Qiongzhou. The products include Chenxiang (Agarwood), Qinggui Xiang (Green Cinnamon Incense), Jigu Xiang (Chicken Bone Incense), and Matizhan Xiang (Horseshoe Stack Incense). All originate from the same tree. The trunk resembles Toona and Zelkova willow; leaves resemble citrus leaves; flowers are white; fruits resemble betel nuts, sized like mulberries. People in Jiaozhi call it Mixiang (Honey Incense). Those wishing to harvest it first cut off the old roots of accumulated age. After a year, the bark dries and rots, but the heartwood and branch joints remain unrotted; this is the incense. Hard, black, and water-sinking material is Chenxiang; fine branches that are solid and do not rot are Qinggui; half-sinking, half-floating material is Jigu; horseshoe-shaped material is Matixiang; coarse material is Zhanxiang.