The article presents one of the scientific text meaning components – the beginning, or introduction, which introduces the text content comprehension. groups of introductions differentiated on basis of scientific and cognitive author’s attitude are described. quantitative comparison of introductions from observed groups, taken from the articles that are published in the selected works of famous scientists R. Jakobson, L. V. Scherba, B. A. Larin and in the collection of articles of 2011 and 2016, is presented.