Find the dissolution rate of a cholesterol gallstone 1 cm in diameter immersed in a solution of bile salts. The solubility of cholesterol in this solution is about 3.5 · 10 -3 g/cm 3. The density difference between the bile saturated with cholesterol and that containing no cholesterol is about 3 · 10 -3 g/cm 3 ; the kinematic viscosity of this solution is about 0.06 cm 2 /sec; the diffusion coef?cient of cholesterol is 1.8 · 10 -6 cm 2 /sec.