EN
The consideration presented in the paper are an attempt to revitalise the Chisholmian categorisations of objects 'via entia per se' and 'entia successiva'. The paper contains a critical survey of the theory of mereological essentialism: it deals with some more important arguments against it and answers as well. The author tries to show that in defense of the categorisation in question the applicability of the doctrine of mereological essentialism must be somehow limited. He suggests that the best way to preserve a relevance of the above categorisation is to restrict theses of mereological essentialism either only to objects 'qua occurrents' or only to objects 'qua continuats' or only to persons.