1. A satisfactory method for the direct determination of the pulmonary arterial pressure in rats is described.

2. The arithmetical mean of the blood pressure in the pulmonary artery in a series of thirty-four normal albino rats under nembutal anesthesia is 256 mm. H20 (18.8 mm. Hg).

3. Intravenous epinephrine causes an abrupt but briefly sustained rise in the pulmonary arterial pressure with a gradual return to normal.

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