Let $x$ be a complex number which has positive real part, and $w_1,\ldots,w_N$ rational numbers. We show that $w^s \zeta_N (s, x \ |\ w_1,\ldots, w_N)$ can expressed as finite linear combination of the Hurwitz zeta functions over $\mathbf Q(x)$, where $\zeta_N (s,x is Barnes function $w$ explicitly determined by $w_1,\ldots, w_N$. Furthermore, we give generalizations Kummer's formula on gamma K...