The study of the histological features of the peripheral retina and the observation of this periphery in 149 cases of uveitis of various types has led us to consider these peripheral retinal inflammations as presenting clinically either as a local reaction in this area during the course of anterior and posterior uveitis, manifested by a circular inflammatory condensation of the peripheral vitreous, or as a specific affection related to the periphery. These latter assume two forms: either that of a peripheral chorio-retinitis, or that of a basal uveo-retinitis, a term proposed in place of those considered inadequate--pars planitis, peripheral uveitis, chronic posterior cyclitis. In accordance with this conception four forms of uveitis can be distinguished: anterior uveitis, posterior uveitis, peripheral chorio-retinitis and basal uveoretinitis.