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The procedure for forming a hexagram and consulting the I Ching available in the West is that of Chu of the Sung (1130-1200). His version was originally the method of the coin oracle (i.e., by tossing three coins), but to justify it he forced it upon the text of the Hsi Tz'u of the I Ching. Instances of the divinatory use of the I ching recorded in the Tso Chuan and Kuo Yi amount to more than 25 cases. Chu Hsi's version cannot explain these cases. Following strictly the text of the Hsi Tz'u Chuan, the author has recovered the original divinatory procedures for forming a hexagram and consulting the I Ching, and they are verified by the recorded cases. The recovered procedures are simpler and more logical and consistent than those of Chu Hsi's version.
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Shih-Chuan Chen (1972) studied this question.
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