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 and others as well as those employed in my experiments of 1885-­1887, in measuring intraabdominal pressures, are not conveniently adapted to our work. While the water column connected to a water manometer gives to the eye finer vacillations than the



slow moving mercury can, it calls for a care in adjusting the level of the spot where the measure is taken to the level of the top of the fluid in the manometer that disbars it for readily multiplying records.