Abstract: A method and apparatus for accurately discharging the entire contents of a container is disclosed. A rigid container has an open upper end and at least one hole in the bottom of the container. The container has a flexible liner with a neck portion which is folded back around the upper end of the container to form a cuff. The cuff is sealed against the sides of the container and the container is inverted. A gas is injected through the hole or holes in the bottom of the container into the space between the flexible liner and the container. This everts the liner and insures that all of the contents of the container are dispensed.

Abstract: A method is disclosed for repeatedly and accurately depositing predetermined amounts of fluid, especially biological fluids, onto generally planar analysis slides. Fluid is aspirated into a disposable metering tip which is rapidly moved into a metering position where the fluid is expelled onto a slide. During movement of the tip into the metering position, a partial vacuum is created on the fluid in the tip, causing the fluid to be drawn up into the tip and thereby preventing fluid from being prematurely expelled onto the slide.