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STRUMPELL 1881 described neurological cases displaying specific anesthesia to cold and reported a very distinct heat sensation when the skin was touched by pieces of ice. It was less often that they found the opposite phenomenon i. e. that heating the skin produced a sensation of cold. In the following years these "paradoxical sensations" were much discussed (see LEHMANN 1892 and v. FREY 1895) and it was definitely established that the stimulation of single cold spots with heat above 45" C led t o a sensation of cold. The existence of a paradoxical cold sensation is thus rather generally accepted while the corresponding paradoxical heat sensation still is under debate. The problem of whether the warm receptors can be stimulated by rapid cooling will be treated by us in another paper in connection with the mode of action of the warm receptors. The purpose of the present study was to investigate how specific cold fibres of the cat's tongue react t o a rise in temperature of the surface of the tongue t o different levels. Methods.The preparation of fine strands of the lingual nerve of the cat as well as the recording of spikes from specific cold fibres has previously been described by ZOTTERMAN (1936). The stimulating devices for the teni-