  An extension of Marcinkiewicz Interpolation Theorem, allowing intermediate
spaces of Orlicz type, is proved. This generalization yields a necessary and
sufficient condition so that every quasilinear operator, which maps the set,
$S(X,\mu)$, of all $\mu$-measurable simple functions on $\sigma$- finite
measure space $(X,\mu)$ into $M(Y,\nu)$, the class of $\nu$-measurable
functions on $\sigma$- finite measure space $(Y,\nu)$, and satisfies endpoint
estimates of type:
  $1 < p< \infty$, $1 \leq r < \infty$, \begin{equation*} \lambda \, \nu \left(
\left\lbrace y \in Y : |(Tf)(y)| > \lambda \right\rbrace \right)^{\frac{1}{p}}
\leq C_{p,r} \left( \int_{\mathbb{R_+}} \mu \left( \left\lbrace x \in X :
|(f)(x)| > t \right\rbrace \right)^{\frac{r}{p}} t^{r-1}dt
\right)^{\frac{1}{r}}, \end{equation*} for all $f \in S(X,\mu)$ and $\lambda
\in \mathbb{R_+}$; is bounded from an Orlicz space into another.
