  1) A wave equation is derived from the kinetic equations governing media with
rotational as well as translational degrees of freedom. In this wave the
fluctuating quantity is a vector, the bulk spin. The transmission is similar to
compressive waves but propagation is possible even in the limit of
incompressibility, where such disturbances could become dominant. 2) In this
context a kinetic theory of space-time is introduced, in which hypothetical
constituents of the space-time manifold possess such a rotational degree of
freedom (spin). Physical fields (i.e. electromagnetic or gravitational) in such
a theory are represented as moments of a statistical distribution of these
constituents. The spin wave equation from 1) is treated as a candidate for
governing light and metric. Such a theory duplicates to first order Maxwell's
equations of electromagnetism, Schrodinger's equation for the electron, and the
Lorentz transformations of special relativity. Slight deviations from the
classical approach are predicted and should be experimentally verifiable.
