[Topographical analysis of the activity of the frog olfactory epithelium (author's transl)].

The analysis of amplitude variations of local E.O.G. collected from 121 points of the olfactory epithelium of the frog, in response to 20 olfactory stimuli, shows: 1. There is a strong correlation between the amplitude of the local E.O.G., and the density of the olfactory receptors in the corresponding recording area. 2. A population of about 400 to 700 receptors contains all kinds of olfactory sensibility, but with variable proportions according to the recording point. 3. At the level of the sampled receptors, spreading over about one sixth of the olfactory surface, an anterio-posterior differentiation appears. 4. The topographical distribution of the local E.O.G. elicited by the 20 stimuli was significantly different from one animal to the other.