May, 1942~ CETENE DIALKYLACETALS 1059 phase (both temperatures in absolute degrees). This equation is valid over the entire range of temperature and composition from the freezing point of the pure component to the eutectic temperature, if the solution is ideal and Q is constant. According to this equation the plot of log X against 1/T will be a straight line. When the data recorded in Table I were plotted in this manner, it was found that only ...