  "Generalized Gibbs' approach" of Schmelzer et al [J. Chem. Phys. 119, 6166
(2003); 124, 194503 (2006)] results in wrong conditions of equilibrium of a
critical embryo with the ambient phase. The presented analysis shows the
shortcomings of this approach and proves the thermodynamic conditions of
equilibrium. Also, a generalized adsorption equation is obtained in different
forms.
