Investigated the conditions which influence the secretion of the parotid gland directly or indirectly. A series of experiments were conducted, in which the secretion was recorded by counting the drops as they fell from the drainage tube. Eight Ss between 8 to 38 yrs of age were involved. Concludes that direct reflexes of the parotid gland were excited by the mechanical, chemical, and protopathic stimulation of the oral mucosa. The secretion produced when a foreign body is chewed involved a specific reaction to a complex group of stimuli. The presence of food in the stomach excited secretion and erotic emotion reduced the quantity of secretion. Reflex secretion was excited by the sight and odor of food, but was conditioned by hunger. Parotid secretion was inhibited by violent muscular activity. There was no direct reflex to olfactory, visual, auditory or tactile stimulations. (PsycINFO Database Record (c) 2006 APA, all rights reserved)