The paper examines the activity of E. Jona in the field of language culture. The analysis is concentrated on two fields, firstly, on the practical problems of language culture, secondly, on the evaluation of the complete language situation from the thirties up to the eighties of the 20th century. The practical sphere is covered especially by those papers which were published in the periodical Slovenska rec. Some older papers are not relevant to current language situation, but a great number of them solve questions, which are problematic even nowadays. Very important is the opinion of E. Jona for the question on language correctness or incorrectness. He was persuaded that there is no sufficient only linguists opinion; but very important is a contemporary language usage and also dialects, which are to be taken into the consideration. Further, the paper reflects the views of E. Jona for the complicated language situation after 1945. He believed that forced tendencies to convergences and divergences in the past caused damage to the nation and to the language as well. Several of these problems are topical also nowadays.