The device shown in Fig. 1 was found quite effective in removing large quantities of water from odor components. Water has always been a problem in odor component analysis because it deactivates chemical absorbers and hastens the degradation of chromatographic columns. This was clearly brought home to us once again during the examination of corn odors. The odor components are not especially volatile and are in low concentration. In order to increase the quantity of material coming from the corn, the corn was gently warmed. This caused large amounts of water vapor to be evolved which ruined the texture and absorption capacity of the chemical absorber being used. In order to remove the water and let the organic components pass, a piece of Whatman IPS, phase separation paper was placed in the vapor line. Phase separation paper is filter paper treated with a silicone which makes it nonwettable by water yet lets organic compounds pass through. Experience had shown us it worked well for separating liquids in two phases, and we found that it also works for separating gases. There is a build-up of back pressure but it was far less than that required to burst the line. After a few hours some water gets through; apparently the silicones are partially dissolved by the organic compounds. However, even then the vast majority of the water is still removed. We feel this technique may be of some use to other investigators, particularly since we know that few are aware of phase separation paper and what it can do.