as determined with a polarographic type membrane po 2 electrode manufactured by diamond general ann arbor aliquots of 1 ml of the suspension were in communication with a column of mercury for measuring volume changes at 1 bar as well as in contact with a prototype titanium probe distal end of which contacted the upper portion of the liquid sample the probe was seated within the pipette by means of a collar that had been built into the device at its node and glued into the inside of a tube that communicated with the pipette the probe driven by a 1500 watt amplifier manufactured by sonics and materials inc was used to degas the liquid sample during 1 minute periods of sonication it was found that the suspension contained approximately 1 ml o 2 g since the suspension ordinarily contains about 0 1 ml o 2 g bar in water and the percent volume of pfc in glycerin is similar to that in water the partial pressure of the gas must have been about 10 bars in order to determine how long the suspension retained the high oxygen concentration the measurement of the oxygen concentration was repeated at 5 10 20 and 30 minutes after delivery of the suspension into a 50 ml beaker over the first 10.