STUDIES OF THE BRAIN STEM

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Abstract
In normal adult pigeons on a normal diet, the intraperitoneal administration of extract of the posterior lobe of the hypophysis causes: 1st, a slight increase in body temperature, not exceeding the limits of the normal diurnal variations, and 2nd, the appearance of polypnea and drooping wings, which are parts of the thermolytic mechanism in birds. In pigeons which have lost excessive amounts of water from the body, extract of the posterior lobe frequently causes an increase of body temperature of 1-3[degree]C. above the upper limits of the diurnal variations. Three methods of causing this tissue dehydration have been employed: dry feeding, exposure of fasting birds to a warm, dry atmosphere, and the production of experimental polyuria in fasting birds by a destructive lesion of the thalamus. In all 3 conditions, the intraperitoneal injection of extract of the posterior lobe was followed by thermic reactions.

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