Society and Hydraulic System in a Tunisian Oasis. This article is devoted to the study of the social and political organization of four villages whose separate communal territories form one continuous palm oasis. A single spring irrigates the oasis. The water supply is divided in halves, each half being shared by two villages belonging to the same çoff. Aspects of the hydraulic system as such are here considered to be indicative of a type of social organization. Insofar as there is no higher authority to control the use of water, the ways in which it is allotted directly reveal the nature of the social equilibrium and the relationships between the groups. A permanent bi-partition of the water flow has replaced the former system of rotation...