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Thesis
Huangfu Rui and Yang Tingshuo’s study of the old annotation to “其字” argues that the passage on the grass, wood and combined radicals has suffered displacement and corruption over a long transmission history. The contradictions among commentators are not simply carelessness; text and annotation have moved.
This matters because reading the Classic of Tea from a single web text is unsafe. The Song Xianchun Baichuan Xuehai edition, the Siku edition and Ming editions differ in ways that change the explanation of the character 茶. Without a named edition, the moral or philosophical argument may rest on a scribal error.
For the general reader, the practical rule is to compare at least two editions and mark the source when a key phrase such as 其字 or 其名 is discussed. For the specialist, collation notes and commentary must be kept separate.
Source: CNKI·《茶经·一之源》“其字旧注”汇考