It is shown, based on the kinetic definition of the drift-orbit-driven
flux, that the drift-orbit-driven flux is related to either the toroi
dal viscosity, or the poloidal viscosity, or a combination of both. Th
is result is the same as that obtained from the less direct moment equ
ation approach [Phys. Fluids 26, 3315 (1983)]. (C) 1996 American Insti
tute of Physics.