Let h be a harmonic function on R(superscript n), n≥2. Then there exists on entire function f on C such that f(u)=h(u, 0, ...., 0) for all real u. This fact has been used to deduce theorems for harmonic function on R(superscript n) from classical results about entire functions. Moreover, we have considered the characterizations of lower order and lower type of h in terms of coefficients and ratio of these successive coefficients occurring in power series expansion of f.