phase of the choroidal arteritis could be observed ophthalmoscopically, and the appearances are described. THIS report concerns a male patient admitted with a PlummerVinson syndrome including dysphagia, angular stomatitis, glossitis, achlorhydria, koilonychia and hypochromic anaemia. The oral lesion and the dysphagia during the first part of observation responded to riboflavin. The finding of impaired dark adaptation (DA) later seemed to offer an opportunity for testing the possible effect of riboflavin and allied factors. These observations are part of a larger study on dark adaptation undertaken in an attempt to use this method for detecting disturbances in general metabolism, and studying quantitatively their possible relation to dietary factors.