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Guide to the twelve files in the medicine and indigenous sciences section, covering pharmaceutical botany, clinical practice, bone-setting, psychiatry, obstetrics, epidemic management, metallurgy, numeracy, and contemporary regulation.
What the Yoruba word for medicine covers, how physical and spiritual causation work together inside one diagnostic act rather than in separate compartments, and why calling this system "traditional" as opposed to "scientific" describes it wrongly.
Who actually practises Yoruba medicine, how the specialisms divide, how a practitioner is trained and how long it takes, and how expertise is checked among practitioners themselves rather than by any outside body.
The scale of the documented Yoruba pharmacopoeia, how plants are classified and named, the tonal wordplay that makes a plant's name a mnemonic for its use, and a worked table of named plants against what pharmacological research has and has not established.
How divination functions as a diagnostic instrument and what kind of reasoning it supports, and Hallen and Sodipo's finding that Yoruba herbalists distinguish knowledge from belief by a criterion stricter than the English one.
The traditional bone-setter's method, what the published outcome studies actually show about which injuries he treats well and which he maims, why patients keep going to him anyway, and the current argument about training rather than banning him.
Yoruba categories for mental disturbance, what traditional treatment consists of including the restraint that is its worst feature, Lambo's village system at Abeokuta and why it changed community psychiatry worldwide, and the trial evidence on collaboration with healers.
What traditional birth attendants do and what the outcome evidence shows, the real demographic explanation for the Yoruba twinning rate and what it is not, infant care practice, and an honest division between what helps, what is neutral and what kills.
What the historical record establishes about West African inoculation knowledge, what the Yoruba actually did about smallpox, the 1907 ban on the Sonponna priesthood and what the evidence for and against the deliberate-spread charge really amounts to, and what the suppression cost.
What laboratory analysis of Yoruba iron, glass and dye actually shows, including the Igbo Olokun glass which turned out to be made rather than imported, and how the reducing chemistry of an indigo vat and a soap ash lye works.
The Yoruba numeral system, which is genuinely unusual among the world's number systems in how heavily it subtracts and how many ways it lets you say one number, plus counting practice, measurement, and what can honestly be said about mathematics in Ifá.
What is and is not documented about Yoruba star knowledge, the agricultural year and how it was kept, and the soil and land classification which has been tested against laboratory soil science and largely held up.
What is actually being researched now, how Nigeria regulates traditional medicine and where the regulation stops, who owns knowledge that becomes a drug, and the contamination data that make the contemporary trade a public health problem in its own right.