Oracle bones () are pieces of ox scapula and turtle plastron, which were used for pyromancy – a form of divination – in ancient China, mainly during the late Shang dynasty. Scapulimancy is the specific term if ox scapulae were used for the divination, plastromancy if turtle plastrons were used. A recent count estimated that there were about 13,000 bones with a total of a little over 130,000 inscriptions in collections in China and some fourteen other countries.
Diviners would submit questions to deities regarding weather, crop planting, the fortunes of members of the royal family, military endeavors, and similar topics. These questions were carved onto the bone or shell in oracle bone script using a sharp tool. Intense heat was then applied with a metal rod until the bone or shell cracked due to thermal expansion. The diviner would then interpret the pattern of cracks and write the prognostication upon the piece as well. Pyromancy with bones continued in China into the Zhou dynasty, but the questions and prognostications were increasingly written with brushes and cinnabar ink, which degraded over time.
The oracle bones bear the earliest known significant corpus of ancient Chinese writing, using an early form of Chinese characters. The inscriptions contain around 5,000 different characters, though the total is uncertain because some may be different versions of the same character. Specialists have agreed on the form, meanings, and sound of a little more than a quarter of them, roughly 1,200 with certainty, but several hundred more under discussion. These known characters comprise much of the core vocabulary of modern Chinese. They provide important information on the late Shang period, and scholars have reconstructed the Shang royal genealogy from the cycle of ancestral sacrifices they record. When they were discovered in the end of the nineteenth century and deciphered in the early twentieth century, these records confirmed the existence of the Shang, which some scholars had until then doubted.
Oraculology is the discipline for the study of oracle bones and the oracle bone script.
Discovery
The Shang-dynasty oracle bones are thought to have been unearthed periodically by local farmers since as early as the Sui and Tang dynasties, and perhaps starting as early as the Han dynasty, but local inhabitants did not realize what the bones were and generally reburied them. During the 19th century, villagers in the area who were digging in the fields discovered a number of bones, and used them as "dragon bones" (), a reference to the traditional Chinese medicine practice of grinding up Pleistocene fossils into tonics or poultices. The turtle shell fragments were prescribed for malaria, while the other animal bones were used in powdered form to treat knife wounds.
In 1899, an antiques dealer from Shandong Province who was searching for Chinese bronzes in the area acquired a number of oracle bones from locals, several of which he sold to Wang Yirong, the chancellor of the Imperial Academy in Beijing. Wang was a knowledgeable collector of Chinese bronzes, and is believed to be the first person in modern times to recognize the oracle bones' markings as ancient Chinese writing similar to that on Zhou dynasty bronzes. A legendary tale relates that Wang was sick with malaria, and his scholar friend Liu E was visiting him and helped examine his medicine. They discovered, before it was ground into powder, that it bore strange glyphs, which they, having studied the ancient bronze inscriptions, recognized as ancient writing. As Xu Yahui states:
It is not known how Wang and Liu actually came across these "dragon bones", but Wang is credited with being the first to recognize their significance. Wang killed himself in 1900 in connection with his involvement in the Boxer Rebellion, and his son later sold the bones to friend Liu E, who published the first book of rubbings of the oracle bone inscriptions in 1903. News of the discovery of the oracle bones spread quickly throughout China and among foreign collectors and scholars, and the market for oracle bones exploded, though many collectors sought to keep the location of the bones' source a secret. Although scholars tried to find their source, antique dealers falsely claimed that the bones came from Tangyin in Henan. In 1908, scholar Luo Zhenyu discovered the source of the bones near Anyang and realized that the area was the site of the last Shang dynasty capital.