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Thesis
Read through modern tea science, “夫珍鲜馥烈者其碗数三次之者碗数五若座客数至五” is not a lab result but a set of variables: cultivar, soil, light and plucking standard.
Text
“For tea of rare freshness and rich fragrance, pour but three bowls; for that of the second grade, five. With five guests, serve three bowls; with seven, five. With fewer than six, no fixed count is kept — but omit one, and let the finest essence make up his portion.”
Context
珍鲜馥烈：珍贵鲜爽、香气馥郁的好茶。行三碗/五碗：分三碗/五碗。阙一人：少算一人。隽永：头汤精华。
Evidence
- Collation: 此句讲分茶之道，各本一致。吴觉农注："行三碗行五碗"是按人数分茶的唐代礼数。
- Existing readings: 吴觉农指出唐代分茶"三碗五碗"非拘于量，而在"淡者自得，浓者共赏"——好茶量少而精，次茶量多而匀，是"以茶会友"的雅量，也是分茶礼仪的雏形。
Analysis
Modern tea science would split “夫珍鲜馥烈者其碗数三次之者碗数五若座客数至五” into cultivar, soil, light and plucking variables. 吴觉农指出唐代分茶"三碗五碗"非拘于量，而在"淡者自得，浓者共赏"——好茶量少而精，次茶量多而匀，是"以茶会友"的雅量，也是分茶礼仪的雏形。 They remain testable, but only with their conditions attached.
Conclusion
The section does not give a universal rule. It demonstrates a method: read the text, the annotation and the Tang context together before making a modern claim.
Source: The Classic of Tea, Chapter VI · The Drinking, section 8; the original is in the public domain.
Experience should be explained, not mystified.