  In search for new methods of determining the primary energy spectrum of
Cosmic Rays, the attention was paid to the density spectrum measurement. New
methods available at present warrant an accurateness of conclusions derived
from the density spectrum measurements. The general statement about the change
of the spectral index of the charged particle density spectrum is confirmed
very clearly. Results concerning the shower size and primary energy spectra are
also presented and discussed. Interesting future prospects for applications of
the density spectrum method are proposed.
