Abstract
The renormalization prescription of t'Hooft and Veltman (see Nucl. Phys., vol.B44, p.189 (1972)) is used to construct crossover scaling functions for the susceptibility and free energy in an isotropic n vector model. Some difficulties in interpreting the epsilon expansion in this context are discussed, and the formalism is illustrated by a calculation of the expansion factor alpha 2 of a polymer in dilute solution.