Thurnwald’s ethnographic legal study draws on his 1906–1909 expedition and focuses on Buin in southern Bougainville. A methodological and geographical introduction precedes accounts of political organization, family and personal status, property, criminal law, and procedure. Its central commitment is to reconstruct obligations through concrete events and relationships rather than treat law as an independently articulated system.
In diesen Studien werden nur Völker der melanesi-schen Gruppe des pazifischen Inselgebiets in Betracht ge-zogen.
English translation: In these studies only peoples of the Melanesian group of the Pacific island region are taken into consideration.
Within this regional scope, Thurnwald limits his detailed findings to Buin rather than generalizing them to Bougainville as a whole. His caution about imposing European legal categories nevertheless coexists with an evolutionary hierarchy: he interprets the absence of abstractly formulated rules as evidence of institutions not yet differentiated from other social practices. Methodological strength and historical limitation thus emerge together.
Geography, settlement, cultivation, migration, and exchange provide the setting in which legal relationships become intelligible. Warfare is especially important because protection and retaliation underpin political allegiance.
Solche feindliche Erobererfahrten von Mono (Treasuryinsel), Alu, Fauro (Shortlandinseln) und auch aus Tambatamba (Choiseul)$^{4)}$ haben fortwährend noch bis vor wenigen Jahren stattgefunden und leben hüben wie drüben noch in aller Gedächtnis.
English translation: Such hostile expeditions of conquest from Mono (Treasury Island), Alu, Fauro (Shortland Islands) and also from Tambatamba (Choiseul)⁴⁾ took place continually until only a few years ago, and are still alive in everyone's memory on both sides.
Raiding belongs here to remembered experience, not merely to a reconstructed past. Thurnwald also records colonial transformations: European intervention curtailed attacks, while introduced venereal disease devastated neighboring populations and affected migration and exchange. These observations qualify any presentation of local institutions as timeless custom.
Political organization rests on únu, ceremonial alliances linking chiefs, followers, and higher-ranking chiefs through protection and blood vengeance. Such ties are personal, require renewal, and may connect an individual to several leaders. Hereditary standing alone does not make authority effective: shell money, feasts, meeting halls, and public recognition sustain it.
Die freien Leute stehen mit dem Häuptling in einem Bande persönlichen Schutz- gegen Treuverhältnisses.
English translation: The free men stand with the chief in a bond of personal protection in return for fealty.
This reciprocal formulation explains both chiefly influence and its limits. Free followers can withdraw support, making reconciliation politically necessary. Yet freedom is distributed unequally: Thurnwald also describes dependants exposed to killing without retaliation or sale for sacrificial death. Autonomy among free men therefore coexists with severe status inequality.
The family discussion distinguishes political allegiance from maternally inherited, exogamous totem membership. Kinship terms express descent, relative age, and gender, making translation a substantive problem for legal inquiry. Marriage establishes an economic household while redistributing protective claims through payments and reciprocal feasting. A woman’s male relatives retain obligations toward her, including retaliation against an abusive husband. Thurnwald consequently interprets bride payments through protection as well as purchase and distinguishes consensual elopement followed by payment from forcible capture. Children’s early economic independence also limits paternal authority.
Funerary observances connect succession with obligations toward the dead. Feasts consume wealth, while possessions and some plantings are destroyed because the deceased’s spirit retains claims over them. Property cannot therefore be understood apart from personal identity and ritual. District land is collectively held and inalienable, but cultivation and customary use establish more specific claims; ownership of planted trees may differ from rights over the soil. Loans, labor services, and reciprocal gifts show shell money operating both as a medium of exchange and as an instrument of dependence. Coconut pledges associated with copra sales are identified as a recent development.
Criminal law and procedure return to dispersed enforcement. Blood vengeance extends responsibility through kinship and alliance rather than isolating an individual offender. Compensation, mediation, feasting, and supervised duels may interrupt hostility without reliably ending it. Sorcery accusations and divination give spiritual causation practical consequences in identifying supposed wrongdoers, whereas incest is assigned principally to ancestral punishment because no human avenger holds a direct claim.
The closing account locates beginnings of judicial procedure in assemblies, chiefly pronouncements, and regulated combat. An elder’s reported desire for a trusted European peacekeeper introduces a colonial answer to fragmented authority. The work reconstructs law through protection, reciprocity, ritual, and retaliation, while its evolutionary and colonial assumptions shape how those relationships are evaluated.
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