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1. Experiments with a face-mask in which the temperature of the air in the face-mask was raised to 40° C while the ambient temperature in the chamber was maintained at 20° C, resulted in a marked increase in respiratory frequency and a slight decline in carotid blood temperature of unshorn sheep. Partially shorn sheep showed only small respiratory responses.

2. Localized infra-red irradiation of the naso-buccal area of unshorn sheep also resulted in an increased respiratory rate.

3. It is suggested that the initiation of polypnoea during infra-red irradiation of the naso-buccal region and following rise in the temperature of the air in the face-mask is due to stimulation of warm receptors in the upper respiratory tract.

4. Cooling the naso-buccal air in the face-mask to 10° C after thermal polypnoea had been established at an ambient temperature of 40° C resulted in a moderate decline of 30-40 respirations/min. This decline was attributed to the stimulation of cold receptors located in the upper respiratory tract.