Responses to a purified air stream were recorded from single cells in the olfactory bulb of rabbits. A large number of cells responded to ipsilateral stimulation and some cells also to contralateral stimulation. The lowest thresholds of 10–20 cm3 air/min were observed in encephale isole preparations under local anesthesia. Most flow responses were excitatory, with phasic and tonic components. In general the phasic component showed a better correlation to the air flow rate than the tonic component. In response to continuous stimulations with constant flow intensities the responses were either constant, decremental or incremental. Incremental effects could last many seconds and declined with frequent repetitions of the stimulus. Excitatory afterresponses were generally associated with incremental responses.