Scapulomancy: Oracle Bones from Shang China to the Present Day

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Scapulomancy reads the cracks of a heated shoulder blade. Shang oracle bones, the earliest Chinese texts, practices of other peoples, and what can be retained today.

Key points

Name	Scapulomancy (shoulder blade); plastromancy for tortoise shells
Shang period	Around 1250–1050 BCE, Anyang region
Materials	Ox shoulder blades, tortoise plastrons
Method	Engraved question, drilled hollows, heat, reading of the cracks
Significance	The oldest substantial corpus of Chinese writing
Other peoples	Mongols, Turks, Innu of Labrador, Scotland (slinneanachd)

Reading the Cracks in a Bone

Scapulomancy is divination by the shoulder blade (scapula) of an animal. The bone is heated until it cracks, and the cracks are read as signs. When the material is a tortoise shell, the practice is called plastromancy, after the ventral part of the shell (the plastron). Both are found together in China, and they are grouped under the name oracle bones.

This divination by fire has an advantage for historians: it leaves durable objects. The surviving bones, sometimes engraved, give us direct access to those who used them, which is rare for a divinatory practice.

Shang China

Oracle bones date mainly from the late Shang dynasty, roughly between 1250 and 1050 BCE, and come mostly from the site of Anyang (Yinxu) in northern China. Diviners engraved questions, often addressed to ancestors: a harvest, a war, a hunt, an illness in the royal family, the weather. They drilled small hollows on the back of the bone and applied a heated point to them; the cracks obtained, shaped like 卜, were read as an answer. The character bu (卜), which denotes divination, reproduces precisely this shape. Sometimes the outcome or the verification was engraved afterwards.

The modern discovery is famous. For a long time, farmers sold these “dragon bones” to apothecaries, who ground them as medicine. In 1899 the scholar Wang Yirong recognised in them ancient writing. In 1908 Luo Zhenyu traced them back to Anyang. Official excavations, carried out from 1928 to 1937, unearthed about 20,000 pieces. Today more than 100,000 inscriptions are estimated to exist, comprising about 5,000 different characters, only some of which are understood with certainty. These texts are the oldest substantial body of Chinese writing and have confirmed the historical existence of the Shang.

The figures vary according to the counts and definitions used; treat them as orders of magnitude.

Precedents and Successors

The practice is older than the Shang: heated and split animal bones are attested in Neolithic China, with examples dating back to the late 4th millennium BCE in Liaoning. Under the Western Zhou the practice continued, and bones found in the 1970s bear series of numbers that some researchers compare with the hexagrams of the I Ching. The latter gradually replaced bones as the manual of consultation.

Scapulomancy is not unique to China. It is attested among peoples of Central Asia (Mongols, Turks), among the Innu of Labrador, described by the ethnologist Frank Speck in the 1930s, and in Britain and Ireland, where the shoulder blade of a roasted sheep was read (slinneanachd in Gaelic). Each tradition has its own logic and spiritual meaning. Similarity of method does not imply a common origin.

Step (Shang)	Action
Preparation	Clean and polish the bone or shell, drill small hollows
Question	Formulate the request to the ancestors, sometimes engraving it
Heat	Apply a heated point in the hollows until it cracks
Reading	Interpret the shape and direction of the cracks
Archiving	Sometimes engrave the answer and its outcome

What to Take From It Today

Scapulomancy is not a practice to reproduce: burning bones raises safety questions (smoke, flying fragments) and questions of respect for animals. Its value lies elsewhere. Oracle bones show a society that consulted uncertainty through a protocol: a question posed in advance, a procedure, a record. It is one of the oldest examples of what we would today call a decision guideline.

You can take from it an exercise: write down an important question, let it rest for a week, then reread it, noting what has changed. The purpose is the same: separating the question from the answer, as the Shang diviners did. For other ways of reading signs, see tasseography, astragalomancy and the guide to other divinations.

Sources and Limits

We know mainly the bones that bear inscriptions; the uninscribed bones, just as numerous, are silent. We do not know everything about the exact role of the heat or the way the cracks were read. Finally, modern practices that claim to “reread” these texts in order to predict the future have no historical basis. For context, see the history of divination.