Abstract
The action of several Streptomyces antibiotics on the ampullar receptors of the isolated posterior semicircular canal of the frog has been studied, using electrophysiological methods. Both the spontaneous activity and the response to stimulus of the ampullar receptors are promptly and reversibly inhibited by the antibiotics tested: the depressant action is higher for streptomycin and lower for dihydrostreptomycin, neomycin and kanamycin.