The relation between the internal temperature and the respiratory movements of hibernating animals

Notes on temperature after spinal transection, with some observations on shivering

“…anterior to the anterior colliculi, exposure for 65 mins. to a room temperature rising from 270 C. to 340 C. raised the rectal temperature from 37.60 C. to 42.70 C. When rectal temperature reached 41.10 C. the breathing frequency which at commencement had been 30 had gradually increased to 75 per min., but at 42.50 rectal temperature the breathing rate was 66 per min. and although slight respiratory action of jaw and mouth angles had developed, the preparation succumbed gradually to the heat exposure, when the rectal temperature reached 42.700 C., without at any time developing "panting" or true thermal polypnaea.…”

“…556(15). In Chart 4 "panting" indicates where Richet's (30,33) "polypnaea" appeared. The polypneea often sets in suddenly; but it can be preceded, and in these experiments was so, by gradual considerable increase of breathing frequency, Heymans' "tachypnaea."…”