  We propose experimental schemes for detection an axionic condensate supposed
to be cosmic dark matter. Various procedures are considered in dependence on
the value of the axion mass.
  There are well known indications that a large part of the Universe mass
exists in a form of dark matter: The analysis of rotation curves of galaxies
leads to the conclusion that the mass of luminous matter is less than 1/10 part
of the total galaxies mass.
  The existence of the dark matter is supported by the so called "virial
paradoxes".
  It turns out that the reach and compact galaxies have unacceptible large
$\bar{\bf v^2}$ being in the same time stable with respect to anothers
characteristics. For such the galaxies to be stable their masses must be one
order greater than the observable ones.
  There are theoretical and observational arguments that this dark matter
cannot be usual barionic matter as dust, planets etc. On the other hand there
are attractive models where the dark matter is non-relativistic gas of light
elementary particles weakly interacting with the "usual" matter. Periodicity in
the distribution of quasars and distant galaxies with the red shift could be
naturally explained in the cosmology with a gas of very light (pseudo)Goldstone
bosons filling the Universe.
  It is well known that during a cooling an ideal Bose gas undergo the Bose
condensation. If the decoupling of axions has been enough early in the
cosmological evolution the axion gas should be in that moment of time in the
Bose condensate state.
