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 The mercury manometer, or the aneroid, influenced by an air column acting through a tube running to an air-filled bag, is subject to some minor inaccuracies, as from compressibility of the air. These may be disregarded, I imagine; as at 75 cm. the air is compressed 1/20, at 150 cm., 1/10,—and most of our quiescent readings are below 75 cm. A record that can be made in a few minutes in an office will permit of comparison of essen­tial differences and is clinically convenient. The woman who