Derived from the Latin expeditio, 'a voyage of war,' the word 'expedition' had roughly parallel usages in French and English from the fifteenth century. In English by the early seventeenth century, it might mean 'a journey, voyage, or excursion made for some definite purpose.' In French by 1835 it could specifically denote a 'maritime expedition.' 1 This chapter treats an expedition in this sense as an extended theatre for the enactment of diverse amalgams of preconception, expectation, precedent, instruction, and emotion in the experiential context of encounters with particular places and their human, faunal, and floral inhabitants. My discussion addresses one strand of a particular subset of maritime expeditions-those to the 'fifth part of the world,' or 'Oceania,' during the classic era of scientific voyaging from 1766 to 1840. The strand is encounters with indigenous people as inscribed in the specialised literary mode of seaborne ethnography, defined as the empirical observations and representations of human populations seen or met by sailors, naturalists, and artists. 2 My examples draw on written and visual materials generated by two French voyages: the ill-starred Enlightenment expedition of Jean-François de Galaup, comte de La Pérouse (1785-8), and the expedition led by Louis de Saulces de Freycinet (1817-20) at the dawn of the post-Napoleonic phase of scientific voyaging.The chapter hinges on two entwined themes. One is the asymmetric status of human encounters in principle and praxis. The official instructions issued to captains and naturalists focus heavily on the physical, nautical, and natural sciences, with ethnographic enquiry only a minor concern. Questions of human relations are mostly limited to pragmatic injunctions to avoid conflict or inhumane treatment of local inhabitants in order to facilitate the critical replenishment of wood, water, and food supplies. 3 However, in practice, encounters with indigenous people during stopovers ashore were axial in voyagers' experience and figured largely in their representations, whether unpublished or published. The resultant empirical cornucopia of seaborne ethnography underpins my second, overarching theme: the significance of 'the expedition' as a key setting for the early production of knowledge about the populations of Oceania. Often produced for its own sake (the scientific motive), such knowledge provided precedents for subsequent travellers,