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In a language, like in other disciplines, some phenomena recede, disappear, and after some time reappear and recur. There are various reasons for that: the interlingual reasons (e.g. the ancient ir, yr have changed into er it into ir, yr, and again into er − in relation with the pronunciation of the slanting e), the actions of linguists (e.g. standardization of the ancient instrumental case -im, -ym, -imi, -ymi the adjectival-pronominal variations in the reform of orthography), borrowing (e.g. diler, tir, trik, sinus with d', t', ŕ, s'), the recurring designates (e.g. lombard), rhyming needs in poetry, and others. The phenomena reappearing in language most often do not result from some developmental tendencies, and with the ancient ones, which have disappeared, are usually loosely linked, often completely by accident.