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In this paper, we shall show that the following translation $I^M$ from thepropositional fragment $\bf L_1$ of Le\'{s}niewski's ontology to modal logic$\bf KTB$ is sound: for any formula $\phi$ and $\psi$ of $\bf L_1$, it isdefined as  \smallskip  (M1) $I^M(\phi \vee \psi)$ = $I^M(\phi) \vee I^M(\psi),$  (M2) $I^M(\neg \phi)$ = $\neg I^M(\phi),$  (M3) $I^M(\epsilon ab)$ = $\Diamond p_a \supset p_a . \wedge . \Box p_a\supset \Box p_b . \wedge . \Diamond p_b \supset p_a,$  \smallskip  \noindent where $p_a$ and $p_b$ are propositional variables corresponding tothe name variables $a$ and $b$, respectively. In the last section, we shallgive some open problems and my conjectures.

A sound interpretation of Le\'sniewski's epsilon in modal logic KTB