  The non-Gaussian measures of the particle number fluctuations -- skewness
$S\sigma$ and kurtosis $\kappa \sigma^2$ -- are calculated in a vicinity of the
critical point. This point corresponds to the end point of the first-order
liquid-gas phase transition. The gaseous phase is characterized by the positive
values of skewness while the liquid phase has negative skew. The kurtosis
appears to be significantly negative at the critical density and supercritical
temperatures. The skewness and kurtosis diverge at the critical point. The
classical van der Waals equation of state in the grand canonical ensemble
formulation is used in our studies. Neglecting effects of the quantum
statistics we succeed to obtain the analytical expressions for the rich
structures of the skewness and kurtosis in a wide region around the critical
point. These results have universal form, i.e., they do not depend on
particular values of the van der Waals parameters $a$ and $b$. The strongly
intensive measures of particle number and energy fluctuations are also
considered and show singular behavior in the vicinity of the critical point.
