F. Richardson 1937 Fort Warner, Hart Mt., Lake Co., Oregon June 1-8, 1937.- A night and half a day were spent at this location - situated on the eastern, gradually sloping exposure of the Hart Mt. plateau. The whole exposure is almost continuous sagebrush with occasional groups of willow and aspen in the shallow canyons, and with an isolated stand of yellow pine (apparently the only one on the whole side of the plateau) mixed with poplar, willow and birch; located at the Fort Warner. Even from our cursory observations, it was clear that this stand has caused a concentration of birds and of many birds. The presence of aridifer associated birds is evidence of this - crossbills, Evening Grosbeaks, Audubon Warblers, woodpeckers and juncos. The occurrence of undoubtedly breeding Redstarts, indicates a western extension of the species, made possible by this stand of "oasis." The potentiality of such an oasis in sub-speciation is of primary interest. Obviously a great many of the same species are found in comparable associations say in mountains west of Warner Valley. The question is, have these species become established by mere chance at Fort Warner, or are the wanderings of birds over relatively short distances, quite frequent?