Expressions for calculating the Tolman correction in terms of the ther
modynamic properties of liquid and gas on the coexistence curve are ob
tained within the modified Van der Waals theory of surface tension. It
is demonstrated that the size effect in surface tension leads to a si
gnificant decrease of the nucleation barrier however, it is not the on
ly factor responsible for the experimentally observed differences betw
een the temperatures of attainable overheat of liquid and the spinodal
curve.