... Under the data of the catalogue of HI absorption line obtained on RATAN-600 it is revealed 98 interstellar HI clouds with the sizes from 0.2 up to 20 pc, with masses from 10E-2 up to 100 masses of the Sun also spectra of the sizes, concentration and masses were constructed. ... The comparison of an obtained spectrum of masses with theoretical ones has shown, that at large masses in interstellar matter the process of coalescence in cloud-cloud collisins predominates. ... Figure 1. ...