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1. The lingual treatment of 1% procaine for 10 min selectively suppressed responses of the rat chorda tympani nerve to anodal current applied to the tongue with NaCl in the bathing medium to about 50% of control but the drug produced no significant suppression in responses to chemical taste stimuli. 2. The magnitude of suppression of response to anodal current varied with concentration of procaine and kind of bathing medium for the current stimulation (larger in the order of NaCl greater than KCl greater than CaCl2 greater than HCl). 3. Such ion specificity in procaine suppression suggests that responses of the chorda tympani nerve to anodal current are provoked through the taste cell (not direct action on the taste nerve), and that the receptor mechanisms for anodal current are at least partly different from that for chemical taste stimuli.
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