In the paper we present Jerzy Perzanowski`s combination ontology and combination ontologic. Ontologic is a logic of the ontic realm. We use it to define a number of ontological notions: ontological foundation, necessity, situation, possible world, ontological generator, ontological space and others. We also define the properties of the ontological space: density and connectedness. Moreover, we attempt to formulate the ontological principle of sufficient reason in the language of combination ontology. At the end of the paper we present sample problems whose solution gives a better understanding of combination ontologic. These problems show the power of expression of combination ontologic.