High-pressure vapor liquid equilibrium {VLE) data for tile ternary mixture ethane+n-butane+n-pentane due to Thodos and co-workers have been correlated by a ternary version of tile modified Leung Grifl]ths model. Data were taken along paths of constant temperature and approximately constant overall composition, and a separate test was made for such constancy. Seventeen different specified overall compositions at Ibur different temperatures were correlated. In general, agreement between the correlation and data is very good, partict, larly for those curves that satisfy tile test for constant overall composition. The ternary model has been constructed from correlations of each of the three constituent binaries withot, t any further adjustable parameters.