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Catheters, or Hollow Bougies

These are made of the same composition as the ordinary bougies, but a piece of polished metallic wire is introduced into the axis of the silk; or tinfoil is rolled round the wire and the composition applied as before. 6372. Caoutchouc, or Elastic Gum Bougies. These are made by applying an ethereal solution of india-rubber to the silk or foil prepared as in the foregoing methods. it may be washed without fear of injury. Where ether is expensive naphtha is employ-