Contraction of the ductus submaxillaris and its chief divisions, in the dog and cat, is excluded as causing augmented sympathetic secretion. The volume-time curves and, derived from them, the rate curves of the salivary secretion show that different processes (secretory and motor) may occur in the submaxillary gland under stimulation of the chorda tympani and sympathetic nerves. The chorda tympani nerve (dog and cat) supplies the secretory elements of the submaxillary gland with secretory fibers. The sympathetic nerve in both animals contains secretory fibers and also motor fibers for the contractile elements of the gland. A view is advanced that there are 2 phases in the augmented sympathetic (after chorda) secretion[long dash]a mechanical phase due to action of motor fibers in the sympathetic nerve; and a secretory phase which appears as a result of previous stimulation of the parasympathetic nerve.