  A partial separation of the variables is practicable for the solution of
Schroedinger's temporally independent equation in cartesian coordinates x,y,z,
which yields moderately simple algebraic formulae for the amplitude functions
involving quantum numbers k,l,m, the same as in spherical polar coordinates.
The properties of angular momentum are thus achieved with no angular variable.
Several plots of surfaces of constant psi(x,y,z) are presented to illustrate
the resemblance of the shapes of these surfaces to the shapes of surfaces of
psi(r,theta,phi) with the corresponding quantum numbers.
