Abstract
Chronic mid-brain and pontile preparations [apparently of cats[long dash]no. not stated] have been maintained for as long as 20 days. The cerebral hemispheres and brain-stem ahead of the section remained in their normal position with an intact blood supply. In these prepara-tions normal sympathetic tone in the eyes and typical signs of rage were readily induced by physiological stimuli. In the mid-brain animal the environmental temp. determines the state of constriction of the cutaneous vessels rather than the temp. of the blood (rectal temp.).

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