Koumiss differs from whey in containing the nutritive constituents of milk, and from milk itself in the important respect that it is in addition an effervescing alcoholic fluid. Koumiss possesses great value in the treatment of phthisis, chronic bronchitis, the low stage of fevers, the stage of convalescence from acute diseases, and in fact in all adynamic states in which the combined effect of alcohol and nutrients may be desirable.