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Thesis
The ten chapters are not parallel encyclopedia entries. Chapter One defines the object; Chapters Two and Three cover picking and processing; Four and Five cover vessels, water and fire; Six drinking; Seven history; Eight provenance; Nine simplification; Ten illustration. Chapter One is the general frame.
It answers “what is tea” before “how to grow, pick, make, boil and drink it”. Read only as botany, the later chapters lose their value premise; read only as tea virtue, the material base disappears.
The structure is “thing first, virtue later”. Lu Yu does not start with spirit and look for examples; he writes the material nature fully, then lets the ethical claim grow out of it. This is the argumentative spine of the book.
Source: 维基文库·茶经/一之源