Evolutionary tracks for 25 and 40 solar masses from Meynet et al. (1994), models with two times the mass-loss rate of De Jager et al. (1988). Some Galactic hypergiants including HR 8752 are indicated with their positions in the HR-diagram, some of them with observed changes of temperature. The Humphreys-Davidson limit and the approximate position of the yellow evolutionary void are indicated. For each model, evolutionary track 3 starts at the higher temperatures and evolves redward until the “mirror point” and then returns to higher temperatures as track 4. For the ZAMS 40 solar-mass model, track 4 goes to high temperatures, while for the ZAMS 25 solar-mass model track 4 goes to an inversion (a secondary “mirror” point) and thereupon goes redward as track 5.