Quasispherical three-dimensional Ag electrodeposits grown at constant potential and damped free convection exhibit a quasi-isotropic radial growth up to a critical radius r(c) congruent-to 0.3 cm and a mass fractal dimension D(M)=2.5. For r much greater than r(c), D(M)-->3. The product nu(r)eta' is nearly constant, nu(r) being the radial growth velocity, and eta' the apparent medium viscosity. It appears that v(r) is determined by the Laplacian field operating between cathode and anode.