Abstract. Presented herein is a mathematical procedure using plain old newtonian dynamics (POND) in determining the density distribution and the mass of spiral galaxies. POND's mathematical approach is to rely solely on newtonian dynamics in explaining the flattening of the disk's rotational velocity—rather then assuming that "dark matter" or a change in Newton's gravitational constant (MOND) is responsible. We will delineate the differences in applying newtonian dynamics when it comes to spherical and spiral galaxies. The application of POND is tested by using M31 rotational curve data compiled by A. Klypin et al, 2002.















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