The examples of interaction between hydrogen peroxide and cristalic substance shows, that in the similar systems a new compounds (X) can be formed, in the molecule of which enter the particles, which are formed from decomposition of H₂O₂ and the corresponding solid substance. Further decomposition of X compounds in the liquid phase goes easily, in consequence of which the initial cristalic substance is formed.

This facts show, that if in the cave air will be present only an insignificant quantity of hydrogen peroxide, and the walls will contain salts or oxides, then the formation of X compounds in significant equalize quantities can be expected. It is necessary to note, that the kind of phenomenon can be formed by a row of organic compounds (the peroxides, acids and others), from heterogenous decomposition of which also active particulars can be formed.

As we mentioned above, the interaction of H₂O₂ with halogens can form also HlO₂ dioxides and the other compounds. All this witnesses about that, the cave chemistry includes numerous reactions, which are not studied and have serious necessity of investigation. Apparently in this natural reactors many other reactions take place, which in usual reactors of laboratory is difficult to realize and investigate. The cave chemistry is very important also for understanding of the mechanism of a certain biological processes. It is known, that the caves are favorable mediums of a certain medical illnesses. The cure of respiratory organs in the salt caves is wide spread. It is spread opinion, that similar properties are caused by maintenance of high concentration of salt in cave atmosphere. The equilibrium concentration of NaCI in gas at room temperature is approximately 10⁸ molecule. cm^-3 [63]. It is necessary to note, that the X compound formed from interaction of H₂O₂ and cristalic salt, the equilibrium concentration of which in gas phase can reach up to the value of 10¹² molecule. cm^-3 by penetrating to the organism, can transport more quantity of salt. It is not expelled that the influence of this salt which penetrates in the organism will be more resultative. The big influence will have the HlO₂ compounds. They have oxidize properties and can more resulting influence on the organisms, than known oxidize ozone (O₃). Those are the questions, which have the necessity of deep and manysided investigation.