a1 Department of Psychiatry, McGill University, Montreal, Canada; and Vaiola Hospital, Tonga
Nineteenth-century theory held that mental disorder was rare in stable, traditional rural societies. Today most societies are rapidly changing, but Tonga still fits that model and the evidence suggests that the psychoses are genuinely infrequent there. It is proposed that both the theory and the evidence deserve further examination.
c1 Address for correspondence: Professor H. B. M. Murphy, Department of Psychiatry, Section of Transcultural Psychiatric Studies, McGill University, 1266 Pine Avenue West, Montreal, PQ, Canada H3G 1A8.